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Anton Chico Formation

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and Adrian Hunt in 1987. Lucas and Hunt subsequently reduced the unit to member rank within the Moenkopi Formation, but its inclusion in the Moenkopi has not been universally accepted. Some red beds previously mapped as
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Nesbitt, Sterling J.; Lucas, Spencer G.; Schoch, Rainer R. (2006). "A new, large archosauriform from the Anton Chico Member of the upper Moenkopi Formation (Middle Triassic), east-central New Mexico, USA".
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Schoch, Rainer R.; Nesbitt, Sterling Müller; Lucas, Spencer G.; Boy, Jürgen A. (March 1, 2010). "The reptile assemblage from the Moenkopi Formation (Middle Triassic) of New Mexico".
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The beds making up this formation were originally the lowest informal member of the Santa Rosa Formation, but were designated as the Anton Chico Formation by
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Anton Chico Formation along I-25 in Glorieta Pass. The Anton Chico is the red beds at lower right. Overlying this is tan beds of the Santa Rosa Formation.
284: 312: 195: 808: 648: 403: 129: 676: 620: 387:, including a basal conglomerate bed. The total thickness of the formation is 22.1 meters (73 ft) at the 677:"Type section of the Permian Bernal Formation and the Permian-Triassic boundary in north-central New Mexico" 188: 503:, particularly in its more northern and western exposures, are now thought to belong to the Anton Chico. 255: 705:"Stratigraphy of the Anton Chico and Santa Rosa Formations, Triassic of east-central New Mexico" 396: 384: 176: 119: 8: 346: 716: 451: 419: 621:"The Moenkopi Formation in east-central New Mexico: stratigraphy and vertebrate fauna" 459:. Reptile fossils are more common and diverse than in the Holbrook Member and include 791: 446: 769: 418:
The Anton Chico Formation was originally correlated with the Holbrook Member of the
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The formation consists mostly of very fine to medium-grained, red-brown to gray-red
787: 765: 500: 495: 364: 649:"The saga of the Dockum Group and the case of the Texas/New Mexico boundary fault" 438: 424: 361: 737:"Revised Triassic stratigraphy in the Tucumcari basin, east-central New Mexico" 472: 802: 481: 460: 456: 407: 357: 240: 210: 197: 139: 64: 29: 468: 433: 429: 388: 445:. Amphibian fossils are abundant and diverse. These include fragments of 392: 39: 720: 704: 442: 350: 230: 105: 84: 49: 476: 475:. The formation has also yielded two incomplete skeletons of a large 464: 376: 162: 89: 743:. New Mexico Museum of Natural History and Science. pp. 150–170 380: 172: 79: 74: 59: 54: 44: 354: 94: 69: 572: 560: 780:
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen
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Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen
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New Mexico Bureau of Mines & Mineral Resources Bulletin
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Dawn of the age of dinosaurs in the American southwest
596: 755: 578: 530: 513: 776: 566: 428:in the formation. The formation also contains the 584: 800: 618: 554: 319: 291: 674: 602: 489: 104: 734: 709:Arizona-Nevada Academy of Science Journal 702: 539: 524: 299:Anton Chico Formation (the United States) 628:New Mexico Geological Society Guidebook 619:Boy, JA; Schoch, RR; Lucas, SG (2001). 801: 646: 590: 739:. In Lucas, S.G.; Hunt, A.P. (eds.). 391:. The formation is exposed along the 16:Geologic formation in New Mexico, US 13: 675:Lucas, S.G.; Hayden, S.N. (1991). 327:Anton Chico Formation (New Mexico) 14: 820: 809:Triassic formations of New Mexico 402:The formation is overlain by the 735:Lucas, S.G.; Hunt, A.P. (1989). 703:Lucas, S.G.; Hunt, A.P. (1987). 567:Nesbitt, Lucas & Schoch 2006 318: 311: 290: 283: 37: 612: 479:and the primitive poposauroid 370: 1: 506: 449:fossils, possibly related to 302:Show map of the United States 555:Boy, Schoch & Lucas 2001 7: 770:10.1127/0077-7749/2009/0030 10: 825: 792:10.1127/njgpa/239/2006/289 413: 353:that was deposited in the 277: 269: 261: 251: 246: 236: 226: 187: 182: 168: 158: 153: 145: 135: 125: 115: 103: 28: 23: 490:History of investigation 422:based on the finding of 603:Lucas & Hayden 1991 256:Anton Chico, New Mexico 455:, and an unidentified 397:Santa Rosa, New Mexico 330:Show map of New Mexico 647:Lehman, T.M. (1994). 540:Lucas & Hunt 1989 525:Lucas & Hunt 1987 343:Anton Chico Formation 24:Anton Chico Formation 404:Santa Rosa Formation 211:35.2078°N 105.1431°W 149:102 feet (31 m) 130:Santa Rosa Formation 207: /  30:Stratigraphic range 684:New Mexico Geology 579:Schoch et al. 2010 452:Stanocephalosaurus 420:Moenkopi Formation 216:35.2078; -105.1431 447:paracyclotosaurid 379:with minor silty 339: 338: 816: 795: 773: 752: 750: 748: 731: 729: 727: 699: 697: 695: 681: 671: 669: 667: 653: 643: 641: 639: 625: 606: 600: 594: 588: 582: 576: 570: 564: 558: 552: 543: 537: 528: 522: 501:Bernal Formation 496:Spencer G. Lucas 406:and lies on the 395:as far south as 331: 322: 321: 315: 303: 294: 293: 287: 222: 221: 219: 218: 217: 212: 208: 205: 204: 203: 200: 108: 99: 36: 21: 20: 824: 823: 819: 818: 817: 815: 814: 813: 799: 798: 746: 744: 725: 723: 693: 691: 679: 665: 663: 651: 637: 635: 623: 615: 610: 609: 601: 597: 589: 585: 577: 573: 565: 561: 553: 546: 538: 531: 523: 514: 509: 492: 473:prolacertiforms 439:actinopterygian 425:Eocyclotosaurus 416: 373: 362:middle Triassic 335: 334: 333: 332: 329: 328: 325: 324: 323: 306: 305: 304: 301: 300: 297: 296: 295: 215: 213: 209: 206: 201: 198: 196: 194: 193: 111: 98: 97: 92: 87: 82: 77: 72: 67: 62: 57: 52: 47: 42: 34: 33: 17: 12: 11: 5: 822: 812: 811: 797: 796: 786:(2): 289–311. 774: 764:(3): 345–369. 753: 732: 700: 672: 644: 614: 611: 608: 607: 595: 583: 571: 559: 544: 529: 511: 510: 508: 505: 491: 488: 461:erythrosuchids 437:and traces of 415: 412: 372: 369: 345:is a geologic 337: 336: 326: 317: 316: 310: 309: 308: 307: 298: 289: 288: 282: 281: 280: 279: 278: 275: 274: 271: 267: 266: 265:Lucas and Hunt 263: 259: 258: 253: 249: 248: 244: 243: 238: 234: 233: 228: 224: 223: 191: 185: 184: 180: 179: 170: 166: 165: 160: 156: 155: 151: 150: 147: 143: 142: 137: 133: 132: 127: 123: 122: 117: 113: 112: 109: 101: 100: 93: 88: 83: 78: 73: 68: 63: 58: 53: 48: 43: 38: 26: 25: 15: 9: 6: 4: 3: 2: 821: 810: 807: 806: 804: 793: 789: 785: 781: 775: 771: 767: 763: 759: 754: 747:September 17, 742: 738: 733: 726:September 17, 722: 718: 714: 710: 706: 701: 689: 685: 678: 673: 661: 657: 650: 645: 638:September 17, 633: 629: 622: 617: 616: 604: 599: 592: 587: 580: 575: 568: 563: 556: 551: 549: 541: 536: 534: 526: 521: 519: 517: 512: 504: 502: 497: 487: 485: 483: 482:Arizonasaurus 478: 474: 470: 466: 462: 458: 457:capitosauroid 454: 453: 448: 444: 440: 436: 435: 431: 427: 426: 421: 411: 409: 408:Artesia Group 405: 400: 398: 394: 390: 386: 382: 378: 368: 366: 363: 359: 356: 352: 348: 344: 314: 286: 276: 272: 268: 264: 260: 257: 254: 250: 245: 242: 241:United States 239: 235: 232: 229: 225: 220: 192: 190: 186: 181: 178: 174: 171: 167: 164: 161: 157: 152: 148: 144: 141: 140:Artesia Group 138: 134: 131: 128: 124: 121: 118: 114: 107: 102: 96: 91: 86: 81: 76: 71: 66: 61: 56: 51: 46: 41: 31: 27: 22: 19: 783: 779: 761: 757: 745:. Retrieved 740: 724:. Retrieved 715:(1): 21–33. 712: 708: 692:. Retrieved 687: 683: 666:September 1, 664:. Retrieved 659: 655: 636:. Retrieved 631: 627: 613:Bibliography 598: 586: 574: 562: 493: 480: 469:rauisuchians 450: 434:Isopodichnus 432: 430:trace fossil 423: 417: 401: 389:type section 385:conglomerate 374: 342: 340: 270:Year defined 247:Type section 177:Conglomerate 18: 694:November 3, 591:Lehman 1994 393:Pecos River 371:Description 349:exposed in 214: / 202:105°08′35″W 189:Coordinates 507:References 465:archosaurs 443:coprolites 351:New Mexico 231:New Mexico 199:35°12′28″N 690:(1): 9–15 634:: 103–109 477:archosaur 377:sandstone 347:formation 252:Named for 163:Sandstone 154:Lithology 146:Thickness 126:Underlies 120:Formation 803:Category 721:40024381 484:babbitti 463:, other 441:fish in 381:mudstone 262:Named by 183:Location 173:Mudstone 136:Overlies 662:: 37–51 414:Fossils 360:of the 355:Anisian 237:Country 159:Primary 35:Anisian 719:  471:, and 365:Period 227:Region 717:JSTOR 680:(PDF) 652:(PDF) 624:(PDF) 169:Other 749:2020 728:2020 696:2021 668:2020 640:2020 383:and 341:The 273:1987 116:Type 40:PreꞒ 788:doi 784:239 766:doi 762:255 660:150 358:Age 805:: 782:. 760:. 713:22 711:. 707:. 688:13 686:. 682:. 658:. 654:. 632:52 630:. 626:. 547:^ 532:^ 515:^ 486:. 467:, 410:. 399:. 367:. 175:, 90:Pg 32:: 794:. 790:: 772:. 768:: 751:. 730:. 698:. 670:. 642:. 605:. 593:. 581:. 569:. 557:. 542:. 527:. 95:N 85:K 80:J 75:T 70:P 65:C 60:D 55:S 50:O 45:Ꞓ

Index

Stratigraphic range
PreꞒ

O
S
D
C
P
T
J
K
Pg
N

Formation
Santa Rosa Formation
Artesia Group
Sandstone
Mudstone
Conglomerate
Coordinates
35°12′28″N 105°08′35″W / 35.2078°N 105.1431°W / 35.2078; -105.1431
New Mexico
United States
Anton Chico, New Mexico
Anton Chico Formation is located in the United States
Anton Chico Formation is located in New Mexico
formation
New Mexico
Anisian

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