Knowledge

Arenig

Source 📝

2635: 3241: 3932: 27: 2027:. These genera may survive into later portions of the Arenig stage, or even into later geological stages. This list should not be thought of in terms of the lifespan of the genera included. 1885:. These genera may survive into later portions of the Arenig stage, or even into later geological stages. This list should not be thought of in terms of the lifespan of the genera included. 1277:. These genera may survive into later portions of the Arenig stage, or even into later geological stages. This list should not be thought of in terms of the lifespan of the genera included. 107:
It was to the middle series (2) that Sedgwick first applied the term "Arenig". In the typical region and in North Wales generally the Arenig series appears to be unconformable upon the
1798: 1261: 4013: 4053: 2348: 2089: 2054: 1868: 1791: 2442: 2310: 2131: 2117: 1514: 855: 2456: 1898: 1840: 1416: 862: 584: 528: 131: 3203: 2866: 2803: 2649: 2498: 2222: 1905: 1805: 1675: 1633: 1591: 1451: 1354: 848: 654: 549: 514: 81:(“On the Geology of Arenig Fawr and Moel Llanfnant", Q.J.G.S. vol. lxi., 1905, pp. 608–640, with maps). The above succession is divisible into: 3498: 3477: 3170: 3137: 3130: 2768: 2463: 1749: 1500: 1247: 1180: 1088: 1008: 633: 577: 500: 460: 350: 322: 139: 3886: 3823: 3774: 3587: 3421: 3217: 3092: 3048: 2964: 2908: 2391: 2166: 2159: 1982: 1919: 1891: 1847: 1770: 1763: 1728: 1707: 1570: 1493: 1479: 1472: 1444: 1437: 1388: 987: 980: 890: 869: 841: 778: 736: 722: 668: 605: 453: 425: 336: 280: 273: 3944: 198:
or by the Llanvirnian of older chronologies. The Arenig and equivalent Floian are represented in North America by the upper three stages of the
3851: 3816: 3629: 3505: 3470: 3435: 3407: 3184: 3144: 3041: 2985: 2505: 2470: 2377: 2296: 2047: 2010: 1947: 1933: 1926: 1861: 1833: 1784: 1742: 1700: 1661: 1626: 1612: 1584: 1556: 1521: 1486: 1381: 1208: 1187: 1147: 1133: 1119: 1069: 1057: 1050: 1015: 973: 923: 883: 813: 799: 715: 542: 521: 507: 493: 467: 418: 397: 357: 315: 248: 3830: 3636: 3615: 3531: 3512: 3323: 3076: 3027: 2950: 2838: 2796: 2384: 2355: 2247: 2198: 2191: 2138: 2110: 2096: 1996: 1912: 1826: 1777: 1714: 1542: 1535: 1402: 1254: 1194: 1076: 1001: 955: 904: 827: 820: 785: 764: 743: 682: 640: 612: 598: 570: 439: 411: 404: 378: 371: 364: 308: 3858: 3739: 3608: 3449: 3400: 3034: 3020: 3013: 2999: 2936: 2901: 2817: 2761: 2705: 2663: 2491: 2449: 2435: 2398: 2341: 2205: 2068: 1854: 1819: 1756: 1721: 1577: 1465: 1043: 1036: 1029: 1022: 792: 729: 703: 675: 647: 563: 556: 535: 474: 432: 329: 301: 115: 3795: 3678: 3657: 3414: 3295: 3109: 2747: 2533: 1961: 1430: 1226: 1166: 1095: 994: 946: 930: 897: 834: 771: 750: 689: 661: 626: 343: 294: 287: 255: 3953: 3809: 3802: 2831: 2698: 1812: 1395: 1173: 1126: 937: 916: 876: 696: 446: 2754: 119: 3980: 3907: 1201: 619: 179: 1140: 186:) and with the same boundaries. The Arenig and Floian rocks are the upper part of the Lower Ordovician and follow the 4025: 4065: 4101: 4137: 3210: 78: 221:
The Arenig rocks were deposited during a sudden worldwide rise in sea level resulting in widespread
1154: 1273:
The following is a list of Actinocerid genera whose fossils are geochronologically found first in
155: 2023:
The following is a list of Endocerid genera whose fossils are geochronologically found first in
1881:
The following is a list of Endocerid genera whose fossils are geochronologically found first in
3711: 2634: 85:
A lower series of gritty and calcareous sediments, the "Arenig Series" as it is now understood;
3937:
One or more of the preceding sentences incorporates text from a publication now in the
222: 194:
in North America) which is the lower part. Either is followed by the Middle Ordovician ICS
183: 8: 3984: 3372: 2859: 2103: 2003: 1975: 167: 3456: 203: 191: 65:
in 1847 with reference to the "Arenig Ashes and Porphyries" in the neighbourhood of
3601: 3463: 2978: 2303: 171: 3879: 3302: 3240: 3062: 2922: 2275: 1563: 1458: 1371: 3594: 3193: 3177: 2971: 2873: 2782: 2405: 2282: 2261: 2254: 2152: 1654: 1647: 1640: 1549: 1283: 235: 199: 127: 225:. The early Ordovician surge in marine diversity also began around this time. 53:
period and also the suite of rocks which were deposited during this interval.
4131: 3948: 3938: 3893: 3746: 3732: 3687: 3622: 3559: 3538: 3358: 3337: 2619: 2477: 2229: 2145: 2061: 2033: 1940: 1735: 1693: 1668: 1528: 1109: 806: 62: 3872: 3865: 3725: 3671: 3580: 3545: 3484: 3442: 3330: 3316: 3281: 3267: 3253: 3224: 2992: 2880: 2726: 2691: 2684: 2612: 2581: 2540: 2333: 2268: 2184: 2175: 2124: 2075: 2040: 1954: 1605: 1598: 1507: 1423: 1239: 1217: 206: 3788: 3781: 3767: 3760: 3753: 3704: 3697: 3643: 3566: 3491: 3351: 3260: 3163: 3116: 3069: 3055: 2887: 2845: 2824: 2740: 2670: 2567: 2512: 2412: 2370: 2317: 1363: 1346: 1337: 1318: 1304: 1297: 963: 263: 187: 96: 74: 66: 30: 3968: 3957:. Vol. 2 (11th ed.). Cambridge University Press. p. 452. 3718: 3428: 3344: 3288: 3274: 3083: 2733: 2719: 2712: 2588: 2547: 2526: 2484: 2428: 2324: 2289: 2237: 2213: 1989: 1684: 1409: 1290: 239: 50: 174:
epoch, between 477.7 and 470 million years ago, contemporary with the
3664: 3650: 3379: 3309: 3233: 3006: 2957: 2810: 2789: 2775: 2603: 2519: 2082: 1968: 1311: 591: 387: 195: 89: 70: 4054:"A compendium of fossil marine animal genera (entry on cephalopoda)" 4014:"A compendium of fossil marine animal genera (entry on brachiopoda)" 158:
was equivalent to the bifidus shale and the Lower Llandeilo Series.
77:. The rock-succession in the Arenig district has been recognized by 3552: 3521: 3393: 3365: 3123: 3102: 2943: 2929: 2915: 2894: 2852: 2627: 2595: 2574: 1619: 151: 135: 108: 4102:"A compendium of fossil marine animal genera (entry on trilobita)" 3844: 3153: 2677: 2639: 483: 210: 147: 143: 123: 100: 38: 20: 26: 3837: 3573: 757: 175: 3386: 2656: 33:, the mountain which lends its name to the geological series 3981:"Palaeos Paleozoic : Ordovician : The Arenig Age" 114:
The Arenig series is represented in North Wales by the
88:
A middle series, mainly volcanic, with shale, the "
170:, the Arenig or Arenigian refers to an age of the 4095: 4093: 4091: 4089: 4087: 4085: 4083: 4129: 4007: 4005: 4003: 4001: 4047: 4045: 4043: 4080: 3998: 209:which is the lower part of the now shortened 4040: 111:rocks; this is not the case in South Wales. 16:Time interval during the Ordovician period 4099: 4051: 4011: 3925: 3923: 3239: 2633: 25: 4130: 3920: 150:. It may be mentioned here that the " 3942: 228: 13: 4106:Bulletins of American Paleontology 4058:Bulletins of American Paleontology 4018:Bulletins of American Paleontology 2555: 122:beds, by the Shelve series of the 14: 4149: 3901: 3930: 1103: 182:, based on a section in Sweden ( 161: 95:The shale and limestones of the 49:) is a time interval during the 19:For the mountains in Wales, see 3973: 3961: 1331: 1233: 1: 3913: 7: 61:The term was first used by 10: 4154: 3943:Howe, John Allen (1911). " 130:of the Lake District, the 56: 18: 216: 202:which is followed by the 2561:Trilobites of the Floian 1268: 4100:Sepkoski, Jack (2002). 4052:Sepkoski, Jack (2002). 4012:Sepkoski, Jack (2002). 3954:Encyclopædia Britannica 142:of slates and shale in 3247: 2643: 34: 4064:: 560. Archived from 4024:: 560. Archived from 3243: 2637: 29: 3245:Colpocoryphe grandis 223:marine transgression 184:Diabasbrottet quarry 2025:upper Arenig strata 1883:lower Arenig strata 1275:upper Arenig strata 4028:on 14 October 2004 3248: 2644: 2349:Pseudancistroceras 2090:Protocyclendoceras 2055:Cyclocyrtendoceras 2004:Proterocameroceras 1976:Proterovaginoceras 1869:Ventrolobendoceras 1792:Retroclitendoceras 168:geologic timescale 35: 3457:Protoencrinurella 2443:Centrotarphyceras 2311:Stereoplasmoceras 2132:Paracyclendoceras 2118:Lobocyclendoceras 1515:Eocyckistomiceras 856:Protohesperonomia 204:Middle Ordovician 4145: 4138:Early Ordovician 4122: 4121: 4119: 4117: 4097: 4078: 4077: 4075: 4073: 4049: 4038: 4037: 4035: 4033: 4009: 3996: 3995: 3993: 3992: 3983:. Archived from 3977: 3971: 3965: 3959: 3958: 3936: 3934: 3933: 3927: 3602:Eleutherocentrus 3464:Protopliomerella 2979:Plesiomegalaspis 2457:Cycloplectoceras 2304:Rhynchorthoceras 1899:Choreanoceroides 1841:Cyrtovaginoceras 1417:Catoraphinoceras 863:Protoskenidiodes 585:Eosotrematorthis 529:Antigonambonites 229:Brachiopod fauna 172:Early Ordovician 132:Ballantrae Group 79:W. G. Fearnsides 4153: 4152: 4148: 4147: 4146: 4144: 4143: 4142: 4128: 4127: 4126: 4125: 4115: 4113: 4098: 4081: 4071: 4069: 4050: 4041: 4031: 4029: 4010: 3999: 3990: 3988: 3979: 3978: 3974: 3966: 3962: 3931: 3929: 3928: 3921: 3916: 3904: 3899: 3880:Tasmanocephalus 3684: 3518: 3303:Diaphanometopus 3230: 3204:Phthanoncoceras 3190: 3150: 3089: 3063:Trigonocercella 2923:Ningkianolithus 2867:Liomegalaspides 2804:Hanchungolithus 2650:Phthanoncoceras 2558: 2556:Trilobite fauna 2553: 2499:Trocholitoceras 2418: 2330: 2276:Glenisteroceras 2223:Phthanoncoceras 2172: 2016: 1906:Escharendoceras 1874: 1806:Subpenhsioceras 1681: 1676:Ventroloboceras 1634:Smithvilloceras 1592:Protocycloceras 1564:Microbaltoceras 1459:Cyrtobaltoceras 1452:Cyclostomiceras 1372:Ellesmerocerida 1355:Barrandeocerida 1334: 1329: 1271: 1236: 1214: 1106: 1101: 943: 849:Progonambonites 655:Hesperonomiella 550:Crossiskenidium 515:Angusticardinia 480: 384: 231: 219: 164: 59: 24: 17: 12: 11: 5: 4151: 4141: 4140: 4124: 4123: 4079: 4039: 3997: 3972: 3960: 3949:Chisholm, Hugh 3918: 3917: 3915: 3912: 3911: 3910: 3903: 3902:External links 3900: 3898: 3897: 3890: 3883: 3876: 3869: 3862: 3855: 3848: 3841: 3834: 3827: 3820: 3813: 3806: 3799: 3792: 3785: 3778: 3771: 3764: 3757: 3750: 3743: 3736: 3729: 3722: 3715: 3708: 3701: 3693: 3692: 3691: 3683: 3682: 3675: 3668: 3661: 3654: 3647: 3640: 3633: 3626: 3619: 3612: 3605: 3598: 3595:Dimeropygiella 3591: 3584: 3577: 3570: 3563: 3556: 3549: 3542: 3535: 3527: 3526: 3525: 3517: 3516: 3509: 3502: 3499:Synhomalonotus 3495: 3488: 3481: 3478:Pterygometopus 3474: 3467: 3460: 3453: 3446: 3439: 3432: 3425: 3418: 3411: 3404: 3397: 3390: 3383: 3376: 3369: 3362: 3355: 3348: 3341: 3334: 3327: 3320: 3313: 3306: 3299: 3292: 3285: 3278: 3271: 3264: 3257: 3249: 3238: 3237: 3229: 3228: 3221: 3214: 3207: 3199: 3198: 3197: 3194:Odontopleurida 3189: 3188: 3181: 3178:Lichakephalina 3174: 3171:Autoloxolichas 3167: 3159: 3158: 3157: 3149: 3148: 3141: 3138:Pseudocalymene 3134: 3131:Phillipsinella 3127: 3120: 3113: 3106: 3098: 3097: 3096: 3088: 3087: 3080: 3073: 3066: 3059: 3052: 3045: 3038: 3031: 3024: 3017: 3010: 3003: 2996: 2989: 2982: 2975: 2972:Paraptychopyge 2968: 2961: 2954: 2947: 2940: 2933: 2926: 2919: 2912: 2905: 2898: 2891: 2884: 2877: 2874:Megalaspidella 2870: 2863: 2856: 2849: 2842: 2835: 2828: 2821: 2814: 2807: 2800: 2793: 2786: 2783:Famatinolithus 2779: 2772: 2769:Ellipsotaphrus 2765: 2758: 2751: 2744: 2737: 2730: 2723: 2716: 2709: 2702: 2695: 2688: 2681: 2674: 2667: 2660: 2653: 2645: 2632: 2631: 2624: 2623: 2616: 2608: 2607: 2606:of the Floian' 2600: 2599: 2592: 2585: 2578: 2571: 2563: 2562: 2557: 2554: 2552: 2551: 2544: 2537: 2530: 2523: 2516: 2509: 2502: 2495: 2488: 2481: 2474: 2467: 2464:Eichwaldoceras 2460: 2453: 2446: 2439: 2432: 2424: 2423: 2422: 2417: 2416: 2409: 2406:Campbelloceras 2402: 2395: 2388: 2381: 2374: 2366: 2365: 2364: 2360: 2359: 2352: 2345: 2337: 2336: 2329: 2328: 2321: 2314: 2307: 2300: 2293: 2286: 2283:Michelinoceras 2279: 2272: 2265: 2262:Gangshanoceras 2258: 2255:Centroonoceras 2251: 2243: 2242: 2241: 2234: 2233: 2226: 2218: 2217: 2210: 2209: 2202: 2195: 2188: 2180: 2179: 2171: 2170: 2163: 2156: 2153:Williamsoceras 2149: 2142: 2135: 2128: 2121: 2114: 2107: 2100: 2093: 2086: 2079: 2072: 2065: 2058: 2051: 2044: 2037: 2029: 2021: 2020: 2015: 2014: 2007: 2000: 1993: 1986: 1979: 1972: 1965: 1958: 1951: 1944: 1937: 1930: 1923: 1916: 1909: 1902: 1895: 1887: 1879: 1878: 1873: 1872: 1865: 1858: 1851: 1844: 1837: 1830: 1823: 1816: 1809: 1802: 1795: 1788: 1781: 1774: 1767: 1760: 1753: 1750:Notocycloceras 1746: 1739: 1732: 1725: 1718: 1711: 1704: 1697: 1689: 1688: 1687: 1680: 1679: 1672: 1665: 1658: 1655:Somalinautilus 1651: 1648:Somalinautilus 1644: 1641:Somalinautilus 1637: 1630: 1623: 1616: 1609: 1602: 1595: 1588: 1581: 1574: 1567: 1560: 1553: 1550:Lawrenceoceras 1546: 1539: 1532: 1525: 1518: 1511: 1504: 1501:Ectocycloceras 1497: 1490: 1483: 1476: 1469: 1462: 1455: 1448: 1441: 1434: 1427: 1420: 1413: 1406: 1399: 1392: 1385: 1377: 1376: 1375: 1368: 1367: 1359: 1358: 1351: 1350: 1342: 1341: 1333: 1330: 1328: 1327: 1322: 1315: 1308: 1301: 1294: 1287: 1284:Leurorthoceras 1279: 1270: 1267: 1266: 1265: 1258: 1251: 1248:Metactinoceras 1243: 1242: 1235: 1232: 1231: 1230: 1222: 1221: 1213: 1212: 1205: 1198: 1191: 1184: 1181:Plectambonites 1177: 1170: 1163: 1158: 1151: 1144: 1137: 1130: 1123: 1115: 1114: 1113: 1105: 1102: 1100: 1099: 1092: 1089:Syntrophinella 1085: 1080: 1073: 1066: 1061: 1054: 1047: 1040: 1033: 1026: 1019: 1012: 1009:Hesperotrophia 1005: 998: 991: 984: 977: 969: 968: 967: 960: 959: 951: 950: 942: 941: 934: 927: 920: 913: 908: 901: 894: 887: 880: 873: 866: 859: 852: 845: 838: 831: 824: 817: 810: 803: 796: 789: 782: 775: 768: 761: 754: 747: 740: 733: 726: 719: 712: 707: 700: 693: 686: 679: 672: 665: 658: 651: 644: 637: 634:Fistulogonites 630: 623: 616: 609: 602: 595: 588: 581: 578:Eodiorthelasma 574: 567: 560: 553: 546: 539: 532: 525: 518: 511: 504: 501:Acanthotoechia 497: 489: 488: 487: 479: 478: 471: 464: 461:Quasithambonia 457: 450: 443: 436: 429: 422: 415: 408: 401: 393: 392: 391: 383: 382: 375: 368: 361: 354: 351:Pomeraniotreta 347: 340: 333: 326: 323:Mylloconotreta 319: 312: 305: 298: 291: 284: 277: 269: 268: 267: 260: 259: 252: 244: 243: 236:Incertae sedis 230: 227: 218: 215: 163: 160: 140:Ribband Series 128:Skiddaw Slates 126:district, the 105: 104: 93: 86: 58: 55: 15: 9: 6: 4: 3: 2: 4150: 4139: 4136: 4135: 4133: 4111: 4107: 4103: 4096: 4094: 4092: 4090: 4088: 4086: 4084: 4068:on 7 May 2008 4067: 4063: 4059: 4055: 4048: 4046: 4044: 4027: 4023: 4019: 4015: 4008: 4006: 4004: 4002: 3987:on 2007-11-13 3986: 3982: 3976: 3970: 3964: 3956: 3955: 3950: 3946: 3940: 3939:public domain 3926: 3924: 3919: 3909: 3906: 3905: 3896: 3895: 3894:Yinpanolithus 3891: 3889: 3888: 3887:Turgicephalus 3884: 3882: 3881: 3877: 3875: 3874: 3870: 3868: 3867: 3863: 3861: 3860: 3856: 3854: 3853: 3849: 3847: 3846: 3842: 3840: 3839: 3835: 3833: 3832: 3828: 3826: 3825: 3824:Porterfieldia 3821: 3819: 3818: 3814: 3812: 3811: 3807: 3805: 3804: 3800: 3798: 3797: 3793: 3791: 3790: 3786: 3784: 3783: 3779: 3777: 3776: 3775:Leioshumardia 3772: 3770: 3769: 3765: 3763: 3762: 3758: 3756: 3755: 3751: 3749: 3748: 3747:Etheridgaspis 3744: 3742: 3741: 3737: 3735: 3734: 3733:Circulocrania 3730: 3728: 3727: 3723: 3721: 3720: 3716: 3714: 3713: 3709: 3707: 3706: 3702: 3700: 3699: 3695: 3694: 3690:of the Floian 3689: 3688:Ptychopariida 3686: 3685: 3681: 3680: 3676: 3674: 3673: 3669: 3667: 3666: 3662: 3660: 3659: 3655: 3653: 3652: 3648: 3646: 3645: 3641: 3639: 3638: 3634: 3632: 3631: 3627: 3625: 3624: 3623:Grinnellaspis 3620: 3618: 3617: 3613: 3611: 3610: 3606: 3604: 3603: 3599: 3597: 3596: 3592: 3590: 3589: 3588:Decoroproetus 3585: 3583: 3582: 3578: 3576: 3575: 3571: 3569: 3568: 3564: 3562: 3561: 3560:Bolbocephalus 3557: 3555: 3554: 3550: 3548: 3547: 3543: 3541: 3540: 3539:Bathyuriscops 3536: 3534: 3533: 3529: 3528: 3524:of the Floian 3523: 3520: 3519: 3515: 3514: 3510: 3508: 3507: 3503: 3501: 3500: 3496: 3494: 3493: 3489: 3487: 3486: 3482: 3480: 3479: 3475: 3473: 3472: 3468: 3466: 3465: 3461: 3459: 3458: 3454: 3452: 3451: 3447: 3445: 3444: 3440: 3438: 3437: 3433: 3431: 3430: 3426: 3424: 3423: 3422:Ovalocephalus 3419: 3417: 3416: 3412: 3410: 3409: 3405: 3403: 3402: 3398: 3396: 3395: 3391: 3389: 3388: 3384: 3382: 3381: 3377: 3375: 3374: 3370: 3368: 3367: 3363: 3361: 3360: 3359:Heliomeroides 3356: 3354: 3353: 3349: 3347: 3346: 3342: 3340: 3339: 3338:Encrinuroides 3335: 3333: 3332: 3328: 3326: 3325: 3321: 3319: 3318: 3314: 3312: 3311: 3307: 3305: 3304: 3300: 3298: 3297: 3293: 3291: 3290: 3286: 3284: 3283: 3279: 3277: 3276: 3272: 3270: 3269: 3265: 3263: 3262: 3258: 3256: 3255: 3251: 3250: 3246: 3242: 3236:of the Floian 3235: 3232: 3231: 3227: 3226: 3222: 3220: 3219: 3218:Diacanthaspis 3215: 3213: 3212: 3211:Ceratocephala 3208: 3206: 3205: 3201: 3200: 3196:of the Floian 3195: 3192: 3191: 3187: 3186: 3182: 3180: 3179: 3175: 3173: 3172: 3168: 3166: 3165: 3161: 3160: 3156:of the Floian 3155: 3152: 3151: 3147: 3146: 3142: 3140: 3139: 3135: 3133: 3132: 3128: 3126: 3125: 3121: 3119: 3118: 3114: 3112: 3111: 3107: 3105: 3104: 3100: 3099: 3095:of the Floian 3094: 3093:Corynexichida 3091: 3090: 3086: 3085: 3081: 3079: 3078: 3074: 3072: 3071: 3067: 3065: 3064: 3060: 3058: 3057: 3053: 3051: 3050: 3049:Taihungshania 3046: 3044: 3043: 3039: 3037: 3036: 3032: 3030: 3029: 3025: 3023: 3022: 3018: 3016: 3015: 3011: 3009: 3008: 3004: 3002: 3001: 2997: 2995: 2994: 2990: 2988: 2987: 2983: 2981: 2980: 2976: 2974: 2973: 2969: 2967: 2966: 2965:Parabasilicus 2962: 2960: 2959: 2955: 2953: 2952: 2948: 2946: 2945: 2941: 2939: 2938: 2934: 2932: 2931: 2927: 2925: 2924: 2920: 2918: 2917: 2913: 2911: 2910: 2909:Mioptychopyge 2906: 2904: 2903: 2899: 2897: 2896: 2892: 2890: 2889: 2885: 2883: 2882: 2878: 2876: 2875: 2871: 2869: 2868: 2864: 2862: 2861: 2857: 2855: 2854: 2850: 2848: 2847: 2843: 2841: 2840: 2836: 2834: 2833: 2829: 2827: 2826: 2822: 2820: 2819: 2815: 2813: 2812: 2808: 2806: 2805: 2801: 2799: 2798: 2794: 2792: 2791: 2787: 2785: 2784: 2780: 2778: 2777: 2773: 2771: 2770: 2766: 2764: 2763: 2759: 2757: 2756: 2752: 2750: 2749: 2745: 2743: 2742: 2738: 2736: 2735: 2731: 2729: 2728: 2724: 2722: 2721: 2717: 2715: 2714: 2710: 2708: 2707: 2703: 2701: 2700: 2696: 2694: 2693: 2689: 2687: 2686: 2682: 2680: 2679: 2675: 2673: 2672: 2668: 2666: 2665: 2661: 2659: 2658: 2654: 2652: 2651: 2647: 2646: 2642: 2641: 2636: 2630:of the Floian 2629: 2626: 2625: 2622: 2621: 2620:Geragnostella 2617: 2615: 2614: 2610: 2609: 2605: 2602: 2601: 2598: 2597: 2593: 2591: 2590: 2586: 2584: 2583: 2579: 2577: 2576: 2572: 2570: 2569: 2565: 2564: 2560: 2559: 2550: 2549: 2545: 2543: 2542: 2538: 2536: 2535: 2531: 2529: 2528: 2524: 2522: 2521: 2517: 2515: 2514: 2510: 2508: 2507: 2503: 2501: 2500: 2496: 2494: 2493: 2489: 2487: 2486: 2482: 2480: 2479: 2478:Hardmanoceras 2475: 2473: 2472: 2468: 2466: 2465: 2461: 2459: 2458: 2454: 2452: 2451: 2447: 2445: 2444: 2440: 2438: 2437: 2433: 2431: 2430: 2426: 2425: 2420: 2419: 2415: 2414: 2410: 2408: 2407: 2403: 2401: 2400: 2396: 2394: 2393: 2392:Shumardoceras 2389: 2387: 2386: 2382: 2380: 2379: 2375: 2373: 2372: 2368: 2367: 2362: 2361: 2358: 2357: 2353: 2351: 2350: 2346: 2344: 2343: 2339: 2338: 2335: 2332: 2331: 2327: 2326: 2322: 2320: 2319: 2315: 2313: 2312: 2308: 2306: 2305: 2301: 2299: 2298: 2294: 2292: 2291: 2287: 2285: 2284: 2280: 2278: 2277: 2273: 2271: 2270: 2266: 2264: 2263: 2259: 2257: 2256: 2252: 2250: 2249: 2245: 2244: 2240:of the Floian 2239: 2236: 2235: 2232: 2231: 2230:Valhalloceras 2227: 2225: 2224: 2220: 2219: 2216:of the Floian 2215: 2212: 2211: 2208: 2207: 2203: 2201: 2200: 2196: 2194: 2193: 2189: 2187: 2186: 2182: 2181: 2178:of the Floian 2177: 2174: 2173: 2169: 2168: 2167:Schmidtoceras 2164: 2162: 2161: 2160:Manchuroceras 2157: 2155: 2154: 2150: 2148: 2147: 2146:Perkinsoceras 2143: 2141: 2140: 2136: 2134: 2133: 2129: 2127: 2126: 2122: 2120: 2119: 2115: 2113: 2112: 2108: 2106: 2105: 2101: 2099: 2098: 2094: 2092: 2091: 2087: 2085: 2084: 2080: 2078: 2077: 2073: 2071: 2070: 2066: 2064: 2063: 2062:Cyptendoceras 2059: 2057: 2056: 2052: 2050: 2049: 2045: 2043: 2042: 2038: 2036: 2035: 2034:Allocotoceras 2031: 2030: 2028: 2026: 2018: 2017: 2013: 2012: 2008: 2006: 2005: 2001: 1999: 1998: 1994: 1992: 1991: 1987: 1985: 1984: 1983:Cyrtendoceras 1980: 1978: 1977: 1973: 1971: 1970: 1966: 1964: 1963: 1959: 1957: 1956: 1952: 1950: 1949: 1945: 1943: 1942: 1941:Clitendoceras 1938: 1936: 1935: 1931: 1929: 1928: 1924: 1922: 1921: 1920:Loxochoanella 1917: 1915: 1914: 1910: 1908: 1907: 1903: 1901: 1900: 1896: 1894: 1893: 1892:Allopiloceras 1889: 1888: 1886: 1884: 1876: 1875: 1871: 1870: 1866: 1864: 1863: 1859: 1857: 1856: 1852: 1850: 1849: 1848:Tallinnoceras 1845: 1843: 1842: 1838: 1836: 1835: 1831: 1829: 1828: 1824: 1822: 1821: 1817: 1815: 1814: 1810: 1808: 1807: 1803: 1801: 1800: 1796: 1794: 1793: 1789: 1787: 1786: 1782: 1780: 1779: 1775: 1773: 1772: 1771:Phragmosiphon 1768: 1766: 1765: 1764:Parapiloceras 1761: 1759: 1758: 1754: 1752: 1751: 1747: 1745: 1744: 1740: 1738: 1737: 1736:Mcqueenoceras 1733: 1731: 1730: 1729:Manitouoceras 1726: 1724: 1723: 1719: 1717: 1716: 1712: 1710: 1709: 1708:Kaipingoceras 1705: 1703: 1702: 1698: 1696: 1695: 1694:Campendoceras 1691: 1690: 1686: 1683: 1682: 1678: 1677: 1673: 1671: 1670: 1669:Veneficoceras 1666: 1664: 1663: 1659: 1657: 1656: 1652: 1650: 1649: 1645: 1643: 1642: 1638: 1636: 1635: 1631: 1629: 1628: 1624: 1622: 1621: 1617: 1615: 1614: 1610: 1608: 1607: 1603: 1601: 1600: 1596: 1594: 1593: 1589: 1587: 1586: 1582: 1580: 1579: 1575: 1573: 1572: 1571:Monogonoceras 1568: 1566: 1565: 1561: 1559: 1558: 1554: 1552: 1551: 1547: 1545: 1544: 1540: 1538: 1537: 1533: 1531: 1530: 1529:Hemichoanella 1526: 1524: 1523: 1519: 1517: 1516: 1512: 1510: 1509: 1505: 1503: 1502: 1498: 1496: 1495: 1494:Dyscritoceras 1491: 1489: 1488: 1484: 1482: 1481: 1480:Diastoloceras 1477: 1475: 1474: 1473:Diaphoroceras 1470: 1468: 1467: 1463: 1461: 1460: 1456: 1454: 1453: 1449: 1447: 1446: 1445:Cumberloceras 1442: 1440: 1439: 1438:Clelandoceras 1435: 1433: 1432: 1428: 1426: 1425: 1421: 1419: 1418: 1414: 1412: 1411: 1407: 1405: 1404: 1400: 1398: 1397: 1393: 1391: 1390: 1389:Apocrinoceras 1386: 1384: 1383: 1379: 1378: 1374:of the Floian 1373: 1370: 1369: 1366: 1365: 1361: 1360: 1357:of the Floian 1356: 1353: 1352: 1349: 1348: 1344: 1343: 1340:of the Floian 1339: 1336: 1335: 1326: 1323: 1321: 1320: 1316: 1314: 1313: 1309: 1307: 1306: 1302: 1300: 1299: 1295: 1293: 1292: 1288: 1286: 1285: 1281: 1280: 1278: 1276: 1264: 1263: 1259: 1257: 1256: 1252: 1250: 1249: 1245: 1244: 1241: 1238: 1237: 1229: 1228: 1224: 1223: 1220:of the Floian 1219: 1216: 1215: 1211: 1210: 1206: 1204: 1203: 1199: 1197: 1196: 1192: 1190: 1189: 1185: 1183: 1182: 1178: 1176: 1175: 1171: 1169: 1168: 1164: 1162: 1159: 1157: 1156: 1152: 1150: 1149: 1145: 1143: 1142: 1138: 1136: 1135: 1131: 1129: 1128: 1124: 1122: 1121: 1117: 1116: 1112:of the Floian 1111: 1110:Strophomenida 1108: 1107: 1104:Strophomenida 1098: 1097: 1093: 1091: 1090: 1086: 1084: 1081: 1079: 1078: 1074: 1072: 1071: 1067: 1065: 1062: 1060: 1059: 1055: 1053: 1052: 1048: 1046: 1045: 1041: 1039: 1038: 1034: 1032: 1031: 1027: 1025: 1024: 1020: 1018: 1017: 1013: 1011: 1010: 1006: 1004: 1003: 999: 997: 996: 992: 990: 989: 988:Boreadocamara 985: 983: 982: 981:Acanthoglypha 978: 976: 975: 971: 970: 966:of the Floian 965: 962: 961: 958: 957: 953: 952: 949:of the Floian 948: 945: 944: 940: 939: 935: 933: 932: 928: 926: 925: 921: 919: 918: 914: 912: 909: 907: 906: 902: 900: 899: 895: 893: 892: 891:Shoshonorthis 888: 886: 885: 881: 879: 878: 874: 872: 871: 870:Pseudomimella 867: 865: 864: 860: 858: 857: 853: 851: 850: 846: 844: 843: 842:Productorthis 839: 837: 836: 832: 830: 829: 825: 823: 822: 818: 816: 815: 811: 809: 808: 807:Platystrophia 804: 802: 801: 797: 795: 794: 790: 788: 787: 783: 781: 780: 779:Paralenorthis 776: 774: 773: 769: 767: 766: 762: 760: 759: 755: 753: 752: 748: 746: 745: 741: 739: 738: 737:Orthambonites 734: 732: 731: 727: 725: 724: 723:Notoscaphidia 720: 718: 717: 713: 711: 708: 706: 705: 701: 699: 698: 694: 692: 691: 687: 685: 684: 680: 678: 677: 673: 671: 670: 669:Jaanussonites 666: 664: 663: 659: 657: 656: 652: 650: 649: 645: 643: 642: 638: 636: 635: 631: 629: 628: 624: 622: 621: 617: 615: 614: 610: 608: 607: 606:Famatinorthis 603: 601: 600: 596: 594: 593: 589: 587: 586: 582: 580: 579: 575: 573: 572: 568: 566: 565: 561: 559: 558: 554: 552: 551: 547: 545: 544: 540: 538: 537: 533: 531: 530: 526: 524: 523: 519: 517: 516: 512: 510: 509: 505: 503: 502: 498: 496: 495: 491: 490: 486:of the Floian 485: 482: 481: 477: 476: 472: 470: 469: 465: 463: 462: 458: 456: 455: 454:Pseudolingula 451: 449: 448: 444: 442: 441: 437: 435: 434: 430: 428: 427: 426:Elliptoglossa 423: 421: 420: 416: 414: 413: 409: 407: 406: 402: 400: 399: 395: 394: 390:of the Floian 389: 386: 385: 381: 380: 376: 374: 373: 369: 367: 366: 362: 360: 359: 355: 353: 352: 348: 346: 345: 341: 339: 338: 337:Orthisocrania 334: 332: 331: 327: 325: 324: 320: 318: 317: 313: 311: 310: 306: 304: 303: 299: 297: 296: 292: 290: 289: 285: 283: 282: 281:Cyrbasiotreta 278: 276: 275: 274:Acanthambonia 271: 270: 266:of the Floian 265: 262: 261: 258: 257: 253: 251: 250: 246: 245: 242:of the Floian 241: 238: 237: 233: 232: 226: 224: 214: 212: 208: 205: 201: 197: 193: 189: 185: 181: 177: 173: 169: 162:Geochronology 159: 157: 153: 149: 145: 141: 138:, and by the 137: 133: 129: 125: 121: 117: 112: 110: 102: 98: 94: 91: 87: 84: 83: 82: 80: 76: 72: 68: 64: 63:Adam Sedgwick 54: 52: 48: 44: 40: 32: 28: 22: 4114:. Retrieved 4109: 4105: 4070:. Retrieved 4066:the original 4061: 4057: 4030:. Retrieved 4026:the original 4021: 4017: 3989:. Retrieved 3985:the original 3975: 3963: 3952: 3945:Arenig Group 3892: 3885: 3878: 3873:Svalbardites 3871: 3866:Stenorhachis 3864: 3857: 3852:Selenoharpes 3850: 3843: 3836: 3829: 3822: 3817:Phorocephala 3815: 3808: 3801: 3794: 3787: 3780: 3773: 3766: 3759: 3752: 3745: 3738: 3731: 3726:Bvalbardites 3724: 3717: 3710: 3703: 3696: 3677: 3672:Raymondaspis 3670: 3663: 3656: 3649: 3642: 3635: 3630:Ischyrophyma 3628: 3621: 3614: 3607: 3600: 3593: 3586: 3581:Ceratopeltis 3579: 3572: 3565: 3558: 3551: 3546:Benthamaspis 3544: 3537: 3530: 3511: 3506:Toletanaspis 3504: 3497: 3490: 3485:Strotactinus 3483: 3476: 3471:Pseudocybele 3469: 3462: 3455: 3448: 3443:Pliomeridius 3441: 3436:Platycoryphe 3434: 3427: 3420: 3413: 3408:Nieszkowskia 3406: 3399: 3392: 3385: 3378: 3371: 3364: 3357: 3350: 3343: 3336: 3331:Encrinurella 3329: 3322: 3317:Eccoptochile 3315: 3308: 3301: 3294: 3287: 3282:Colpocoryphe 3280: 3273: 3268:Ceraurinella 3266: 3259: 3254:Bathycheilus 3252: 3244: 3225:Selenopeltis 3223: 3216: 3209: 3202: 3185:Metopolichas 3183: 3176: 3169: 3162: 3145:Theamataspis 3143: 3136: 3129: 3122: 3115: 3108: 3101: 3082: 3075: 3068: 3061: 3054: 3047: 3042:Stapeleyella 3040: 3033: 3026: 3019: 3012: 3005: 2998: 2993:Pricyclopyge 2991: 2986:Presbynileus 2984: 2977: 2970: 2963: 2956: 2949: 2942: 2935: 2928: 2921: 2914: 2907: 2900: 2893: 2886: 2881:Megalaspides 2879: 2872: 2865: 2858: 2851: 2844: 2837: 2830: 2823: 2816: 2809: 2802: 2795: 2788: 2781: 2774: 2767: 2760: 2753: 2746: 2739: 2732: 2727:Ceratolithus 2725: 2718: 2711: 2704: 2697: 2692:Australopyge 2690: 2685:Aspidaeglina 2683: 2676: 2669: 2662: 2655: 2648: 2638: 2618: 2613:Galbagnostus 2611: 2594: 2587: 2582:Macrogrammus 2580: 2573: 2566: 2546: 2541:Estonioceras 2539: 2532: 2525: 2518: 2511: 2506:Wichitoceras 2504: 2497: 2490: 2483: 2476: 2471:Eurystomites 2469: 2462: 2455: 2448: 2441: 2434: 2427: 2411: 2404: 2397: 2390: 2383: 2378:Moreauoceras 2376: 2369: 2354: 2347: 2340: 2334:Tarphycerida 2323: 2316: 2309: 2302: 2297:Oxfordoceras 2295: 2288: 2281: 2274: 2269:Geisonoceras 2267: 2260: 2253: 2246: 2228: 2221: 2204: 2197: 2190: 2185:Bajkaloceras 2183: 2176:Intejocerida 2165: 2158: 2151: 2144: 2137: 2130: 2125:Meniscoceras 2123: 2116: 2109: 2102: 2095: 2088: 2081: 2076:Lobendoceras 2074: 2067: 2060: 2053: 2048:Chihlioceras 2046: 2041:Cassinoceras 2039: 2032: 2024: 2022: 2011:Thylacoceras 2009: 2002: 1995: 1988: 1981: 1974: 1967: 1960: 1955:Cotteroceras 1953: 1948:Coreanoceras 1946: 1939: 1934:Telleroceras 1932: 1927:Sewardoceras 1925: 1918: 1911: 1904: 1897: 1890: 1882: 1880: 1867: 1862:Penhsioceras 1860: 1853: 1846: 1839: 1834:Chisiloceras 1832: 1825: 1818: 1811: 1804: 1797: 1790: 1785:Pliendoceras 1783: 1776: 1769: 1762: 1755: 1748: 1743:Mysticoceras 1741: 1734: 1727: 1720: 1713: 1706: 1701:Dartonoceras 1699: 1692: 1674: 1667: 1662:Vassaroceras 1660: 1653: 1646: 1639: 1632: 1627:Rudolfoceras 1625: 1618: 1613:Rhabdiferous 1611: 1606:Rangeroceras 1604: 1599:Quebecoceras 1597: 1590: 1585:Pictetoceras 1583: 1576: 1569: 1562: 1557:Meikeloceras 1555: 1548: 1541: 1534: 1527: 1522:Eothinoceras 1520: 1513: 1508:Endorioceras 1506: 1499: 1492: 1487:Dwightoceras 1485: 1478: 1471: 1464: 1457: 1450: 1443: 1436: 1429: 1424:Cochlioceras 1422: 1415: 1408: 1401: 1394: 1387: 1382:Amsleroceras 1380: 1362: 1345: 1324: 1317: 1310: 1303: 1296: 1289: 1282: 1274: 1272: 1260: 1253: 1246: 1240:Actinocerida 1225: 1218:Trimerellida 1209:Tourmakeadia 1207: 1200: 1193: 1188:Reinversella 1186: 1179: 1172: 1165: 1160: 1153: 1148:Calyptolepta 1146: 1139: 1134:Aporthophyla 1132: 1125: 1120:Acanthorthis 1118: 1094: 1087: 1082: 1075: 1070:Rugostrophia 1068: 1063: 1058:Rectotrophia 1056: 1051:Porambonites 1049: 1042: 1035: 1028: 1021: 1016:Idiostrophia 1014: 1007: 1000: 993: 986: 979: 974:Acanthorthis 972: 954: 936: 929: 924:Trematorthis 922: 915: 910: 903: 896: 889: 884:Rhynchorthis 882: 875: 868: 861: 854: 847: 840: 833: 826: 819: 814:Platytoechia 812: 805: 800:Phragmorthis 798: 791: 784: 777: 770: 763: 756: 749: 742: 735: 728: 721: 716:Nocturneilla 714: 709: 702: 695: 688: 681: 674: 667: 660: 653: 646: 639: 632: 625: 618: 611: 604: 597: 590: 583: 576: 569: 562: 555: 548: 543:Astraborthis 541: 534: 527: 522:Anomalorthis 520: 513: 508:Anchigonites 506: 499: 494:Acanthorthis 492: 473: 468:Rafanoglossa 466: 459: 452: 445: 438: 431: 424: 419:Ectenoglossa 417: 410: 403: 398:Acanthorthis 396: 377: 370: 363: 358:Pseudocrania 356: 349: 342: 335: 328: 321: 316:Multispinula 314: 307: 300: 293: 286: 279: 272: 254: 249:Eurorthisina 247: 234: 220: 207:Whiterockian 165: 154:" Series of 113: 106: 92:Series"; and 60: 46: 42: 36: 3831:Prosopiscus 3789:Nambeetella 3782:Lordshillia 3768:Lacorsalina 3761:Gymnostomix 3754:Furcalithus 3705:Annamitella 3698:Anaximander 3644:Lutesvillia 3637:Ischyrotoma 3616:Goniotelina 3567:Carolinites 3532:Acidiphorus 3513:Xystocrania 3492:Sycophantia 3352:Gyrometopus 3324:Ectenonotus 3261:Calymenella 3164:Apatolichas 3117:Ectillaenus 3077:Zhenganites 3070:Tungtzuella 3056:Thysanopyge 3028:Robergiella 2951:Ogygiocaris 2888:Mendolaspis 2846:Lachnostoma 2839:Isoteloides 2825:Hunnebergia 2741:Cnemidopyge 2671:Anebolithus 2568:Canningella 2513:Tarphyceras 2413:Aphetoceras 2385:Pilotoceras 2371:Alaskoceras 2356:Seelyoceras 2318:Tajaroceras 2248:Buttsoceras 2199:Intejoceras 2192:Evencoceras 2139:Cacheoceras 2111:Dideroceras 2097:Yehlioceras 1997:Chaohuceras 1913:Lebetoceras 1827:Vaginoceras 1799:Stenosiphon 1778:Platysiphon 1715:Kugeloceras 1543:Kyminoceras 1536:Irianoceras 1403:Bakeroceras 1364:Plectoceras 1347:Eobactrites 1338:Orthocerids 1332:Orthocerida 1319:Adamsoceras 1305:Wutinoceras 1298:Actinoceras 1255:Ordosoceras 1234:Cephalopoda 1195:Schedophyla 1155:Christiania 1077:Stenocamara 1002:Doloresella 964:Pentamerida 956:Dictyonites 905:Taphrorthis 828:Pomatotrema 821:Polytoechia 786:Paurorthina 765:Oslogonites 744:Orthidiella 683:Lomatorthis 641:Glossorthis 613:Fasciculina 599:Euorthisina 571:Diparelasma 440:Paldiskites 412:Dictyobolus 405:Aulonotreta 379:Torynelasma 372:Schizotreta 365:Scaphelasma 309:Lurgiticoma 264:Acrotretida 240:brachiopods 192:Gasconadian 188:Tremadocian 75:North Wales 67:Arenig Fawr 31:Arenig Fawr 3991:2007-12-11 3969:Ordovician 3914:References 3859:Stegnopsis 3740:Endymionia 3719:Bulnibarbi 3712:Balnibarbi 3609:Goniophrys 3450:Pliomerops 3429:Placoparia 3401:Neseuretus 3345:Evropeites 3289:Cybelopsis 3275:Colobinion 3084:Zuninaspis 3035:Seleneceme 3021:Rhombampyx 3014:Ptychopyge 3000:Psilacella 2937:Ogmasaphus 2902:Microparia 2818:Hungioides 2762:Dionidella 2734:Cloacaspis 2720:Bumastides 2713:Borogothus 2706:Bohemopyge 2664:Ampyxoides 2589:Priceaspis 2548:Tragoceras 2527:Curtoceras 2492:Pionoceras 2485:Holmiceras 2450:Clytoceras 2436:Bentoceras 2429:Aethoceras 2399:Pycnoceras 2342:Deltoceras 2325:Wardoceras 2290:Orthoceras 2238:Nautiloids 2214:Oncocerids 2206:Rossoceras 2069:Kirkoceras 1990:Anthoceras 1855:Juaboceras 1820:Yorkoceras 1757:Oderoceras 1722:Lobosiphon 1685:Endocerida 1578:Ogygoceras 1466:Desioceras 1410:Baltoceras 1291:Nybyoceras 1262:Polydesmia 1083:Syntrophia 1044:Lycophoria 1037:Liricamera 1030:Karakulina 1023:Imbricatia 793:Paurorthis 730:Oligorthis 704:Nereidella 676:Ladogiella 648:Glypterina 564:Desmorthis 557:Dalmanella 536:Apomatella 475:Volborthia 433:Monobolina 330:Numericoma 302:Karnotreta 116:Garth Grit 51:Ordovician 3967:ICS; see 3796:Novakella 3679:Telephina 3665:Rananasus 3658:Petigurus 3651:Oenonella 3415:Ormathops 3380:Kolymella 3310:Dindymene 3296:Cybelurus 3234:Phacopida 3110:Dysplanus 3007:Psilocara 2958:Opipeuter 2860:Lapidaria 2811:Hoekaspis 2790:Globampyx 2776:Falanapis 2748:Degamella 2604:Agnostida 2534:Arkoceras 2520:Litoceras 2083:Najaceras 1969:Endoceras 1962:Piloceras 1431:Copiceras 1312:Ormoceras 1227:Dinobolus 1167:Leptestia 1096:Xenelasma 995:Camerella 947:Paternida 931:Valcourea 898:Sinorthis 835:Prantlina 772:Panderina 751:Orthidium 690:Monorthis 662:Incorthis 627:Ffynnonia 592:Estlandia 388:Lingulida 344:Polylasma 295:Issedonia 288:Eoconulus 256:Tegulella 196:Dapingian 90:Llandeilo 71:Merioneth 47:Arenigian 4132:Category 4116:19 April 4072:17 April 4032:27 April 3810:Peraspis 3803:Oopsites 3553:Biolgina 3522:Proetida 3394:Lyrapyge 3366:Kanoshia 3124:Panderia 3103:Bumastus 2944:Ogyginus 2930:Niobides 2916:Myttonia 2895:Merlinia 2853:Lannacus 2832:Isocolus 2699:Bergamia 2628:Asaphida 2596:Thymurus 2575:Gogoella 1813:Utoceras 1620:Rioceras 1396:Avoceras 1325:Georgina 1174:Petroria 1127:Ahtiella 938:Virgoria 917:Treioria 877:Raunites 710:Neumania 697:Munhella 447:Paterula 200:Canadian 156:H. Hicks 152:Llanvirn 136:Ayrshire 109:Cambrian 3951:(ed.). 3941::  3908:palaeos 3845:Sagavia 3154:Lichida 2755:Dionide 2678:Asaphus 2640:Asaphus 1064:Rosella 911:Tarfaya 484:Orthida 211:Chazyan 178:of the 166:In the 148:Wexford 144:Wicklow 124:Corndon 120:Ty Obry 101:Caradoc 57:History 39:geology 21:Arenigs 3947:". In 3935:  3838:Pytine 3574:Celmus 3373:Kawina 1202:Taffia 1161:Ingria 758:Orthis 620:Ferrax 217:Events 176:Floian 103:Stage. 43:Arenig 41:, the 4112:: 560 3387:Lehua 2657:Ampyx 2421:Upper 2363:Lower 2104:Nanno 2019:Upper 1877:Lower 1269:Upper 1141:Borua 69:, in 4118:2008 4074:2008 4034:2008 146:and 118:and 97:Bala 45:(or 4110:364 4062:364 4022:364 2797:Gog 180:ICS 134:of 99:or 37:In 4134:: 4108:. 4104:. 4082:^ 4060:. 4056:. 4042:^ 4020:. 4016:. 4000:^ 3922:^ 213:. 73:, 4120:. 4076:. 4036:. 3994:. 190:( 23:.

Index

Arenigs

Arenig Fawr
geology
Ordovician
Adam Sedgwick
Arenig Fawr
Merioneth
North Wales
W. G. Fearnsides
Llandeilo
Bala
Caradoc
Cambrian
Garth Grit
Ty Obry
Corndon
Skiddaw Slates
Ballantrae Group
Ayrshire
Ribband Series
Wicklow
Wexford
Llanvirn
H. Hicks
geologic timescale
Early Ordovician
Floian
ICS
Diabasbrottet quarry

Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.