363:
Pre-Nectarian rocks are rare in the lunar sample suite; they are mostly composed of lunar highlands material which have been heavily churned, brecciated, and thermally affected by subsequent impacts, particularly during the Heavy
Bombardment Eon (HBE; a period of 0.6-1 Gy from the formation of the
984:
Fernandes V. A., Fritz J., Weiss B., Garrick-Bethel and
Shuster D. (2013) The bombardment history of the Moon as recorded by 40Ar-39Ar chronology. Meteor. and Planet. Sci. 48, 241–269. DOI: 10.1111/maps.12054.
929:
exists from the time spanned by the pre-Nectarian period of the Moon, the pre-Nectarian has been used as a guide by at least one notable scientific work to subdivide the unofficial terrestrial
383:(4.533 - 4.172 Ga ago) and Basin Groups 1-9 (4.172 - 3.92 Ga ago), but these divisions are not used on any geologic maps. Similarly the later period has also been called the
364:
Moon until at least the formation of the
Imbrium Basin ~3.9 Ga, or even later with the formation of Orientale Basin) that marks the approximate beginning of the
398:
803:
396:
993:
Fritz J., Bitsch B., KĂĽhrt E., Morbidelli A., Tornow C., WĂĽnnemann K., Fernandes V.A., Grenfell L.J., Rauer H., Wagner R. and
393:
391:
395:
392:
372:, which suggests that the early stage of lunar crustal formation occurred via mineral crystallization of a global
1080:
956:, though the first two of these lunar divisions are informal and collectively make up the pre-Nectarian.
474:
394:
851:
756:
682:
340:
304:
821:
1099:
752:
608:
485:
1035:
766:
646:
997:(2014) Earth-like habitats in planetary systems. Planetary and Space Science 98, 254–267.
742:
8:
994:
580:
459:
368:
period. The primary pre-Nectarian lunar highland material is dominated by the rock type
807:
544:
592:
864:
841:
623:
327:
225:
56:
1039:
789:
686:
564:
504:
1104:
1084:
965:
877:
831:
596:
576:
560:
30:
661:
657:
548:
519:
508:
489:
348:
249:
1029:
236:
1093:
953:
933:
636:
612:
531:
214:
51:
343:
runs from 4.533 billion years ago (the time of the initial formation of the
945:
779:
729:
284:
Periods on the Lunar
Geologic Timescale. Axis scale: Millions of years ago.
941:
672:
369:
1059:
W. Harland; R. Armstrong; A. Cox; L. Craig; A. Smith; D. Smith (1990).
949:
365:
352:
188:
46:
1058:
1044:
922:
201:
41:
1077:
1012:
937:
930:
916:
390:
926:
379:
This geologic period has been informally subdivided into the
373:
344:
998:
1028:
Wilhelms, Don; McCauley, John; Trask, Newell (1987).
1027:
351:
was formed by a large impact. It is followed by the
72:
1017:. U.S. Geological Survey Professional Paper 1348.
1091:
936:. In particular, it is sometimes found that the
16:Geologic period, 4533 to 3920 million years ago
894:craters' names are separately linked to their
892:For basins with no article, the two prominent
1010:
917:Relationship to Earth's geologic time scale
1043:
871:
815:
773:
736:
630:
497:
468:
347:) to 3.920 billion years ago, when the
1092:
282:
13:
1004:
14:
1116:
1071:
1031:The geologic history of the Moon
409:
402:Millions of years before present
34:
1052:
1021:
987:
978:
358:
1:
1063:. Cambridge University Press.
971:
903:Names of proposed basins are
1014:Geologic History of the Moon
858:
796:
7:
959:
881:
868:
855:
845:
835:
825:
812:
793:
783:
770:
760:
746:
733:
690:
676:
666:
650:
640:
627:
617:
601:
585:
569:
553:
537:
525:
513:
494:
478:
465:
419:as categorized by Wilhelms
283:
172:
10:
1121:
1061:A Geologic time scale 1989
1001:10.1016/j.pss.2014.03.003i
966:Hadean eon–related topics
701:
431:
427:
323:
318:
310:
300:
295:
70:
65:
26:
21:
341:lunar geologic timescale
314:Lunar Geologic Timescale
148:−1000 —
138:−1500 —
128:−2000 —
118:−2500 —
108:−3000 —
98:−3500 —
88:−4000 —
78:−4500 —
75:
1078:Palaeos.org: Hadean eon
940:is subdivided into the
158:−500 —
1034:. Professional Paper.
1011:Don Wilhelms (1987).
1036:US Geological Survey
896:respective articles.
337:pre-Nectarian period
999:https://dx.doi.org/
921:Since little or no
852:Freundlich-Sharonov
424:
416:Lunar impact basins
1083:2016-07-28 at the
414:
324:Chronological unit
311:Time scale(s) used
914:
913:
886:
885:
822:Schiller-Zucchius
695:
694:
475:South Pole-Aitken
403:
333:
332:
296:Usage information
290:
289:
1112:
1065:
1064:
1056:
1050:
1049:
1047:
1025:
1019:
1018:
1008:
1002:
991:
985:
982:
910:
897:
699:
698:
429:
428:
425:
413:
401:
252:
239:
204:
191:
169:
164:
159:
154:
149:
144:
139:
134:
129:
124:
119:
114:
109:
104:
99:
94:
89:
84:
79:
73:
33:
19:
18:
1120:
1119:
1115:
1114:
1113:
1111:
1110:
1109:
1090:
1089:
1085:Wayback Machine
1074:
1069:
1068:
1057:
1053:
1038:. p. 148.
1026:
1022:
1009:
1005:
992:
988:
983:
979:
974:
962:
919:
908:
902:
895:
893:
891:
714:
647:Tranquillitatis
444:
418:
412:
406:
404:
399:
397:
361:
291:
286:
285:
278:
277:
276:
271:
270:
269:
264:
263:
262:
257:
256:
255:
250:
244:
243:
242:
237:
231:
230:
229:
220:
219:
218:
209:
208:
207:
202:
196:
195:
194:
189:
183:
182:
181:
170:
167:
165:
162:
160:
157:
155:
152:
150:
147:
145:
142:
140:
137:
135:
132:
130:
127:
125:
122:
120:
117:
115:
112:
110:
107:
105:
102:
100:
97:
95:
92:
90:
87:
85:
82:
80:
77:
61:
60:
59:
54:
49:
44:
39:
28:
17:
12:
11:
5:
1118:
1108:
1107:
1102:
1088:
1087:
1073:
1072:External links
1070:
1067:
1066:
1051:
1045:10.3133/pp1348
1020:
1003:
986:
976:
975:
973:
970:
969:
968:
961:
958:
918:
915:
912:
911:
899:
898:
888:
887:
884:
883:
880:
874:
873:
870:
867:
861:
860:
857:
854:
848:
847:
844:
838:
837:
834:
828:
827:
824:
818:
817:
814:
811:
799:
798:
795:
792:
786:
785:
782:
776:
775:
772:
769:
767:Coulomb-Sarton
763:
762:
759:
749:
748:
745:
739:
738:
735:
732:
726:
725:
722:
718:
717:
710:
705:
696:
693:
692:
689:
679:
678:
675:
669:
668:
665:
653:
652:
649:
643:
642:
639:
633:
632:
629:
626:
620:
619:
616:
604:
603:
600:
588:
587:
584:
572:
571:
568:
556:
555:
552:
540:
539:
536:
528:
527:
524:
516:
515:
512:
500:
499:
496:
493:
481:
480:
477:
471:
470:
467:
464:
456:
455:
452:
448:
447:
440:
435:
411:
408:
400:
389:
360:
357:
349:Nectaris Basin
331:
330:
325:
321:
320:
316:
315:
312:
308:
307:
302:
301:Celestial body
298:
297:
293:
292:
288:
287:
280:
279:
274:
273:
272:
267:
266:
265:
260:
259:
258:
247:
246:
245:
234:
233:
232:
223:
222:
221:
212:
211:
210:
199:
198:
197:
186:
185:
184:
175:
174:
173:
171:
168:0 —
166:
161:
156:
151:
146:
141:
136:
131:
126:
121:
116:
111:
106:
101:
96:
91:
86:
81:
76:
71:
68:
67:
63:
62:
55:
50:
45:
40:
35:
29:4533 – 3920
27:
24:
23:
15:
9:
6:
4:
3:
2:
1117:
1106:
1103:
1101:
1100:Pre-Nectarian
1098:
1097:
1095:
1086:
1082:
1079:
1076:
1075:
1062:
1055:
1046:
1041:
1037:
1033:
1032:
1024:
1016:
1015:
1007:
1000:
996:
990:
981:
977:
967:
964:
963:
957:
955:
954:Lower Imbrian
951:
947:
943:
939:
935:
932:
928:
924:
906:
901:
900:
890:
889:
879:
876:
875:
866:
863:
862:
853:
850:
849:
843:
840:
839:
833:
830:
829:
823:
820:
819:
810:
809:
805:
801:
800:
791:
788:
787:
781:
778:
777:
768:
765:
764:
758:
754:
751:
750:
744:
741:
740:
731:
728:
727:
723:
720:
719:
716:
711:
709:
706:
704:
700:
697:
688:
684:
681:
680:
674:
671:
670:
664:
663:
659:
655:
654:
648:
645:
644:
638:
635:
634:
625:
622:
621:
615:
614:
610:
606:
605:
599:
598:
594:
590:
589:
583:
582:
578:
574:
573:
567:
566:
562:
558:
557:
551:
550:
546:
542:
541:
535:
534:
530:
529:
523:
522:
518:
517:
511:
510:
506:
502:
501:
492:
491:
487:
483:
482:
476:
473:
472:
463:
462:
458:
457:
453:
450:
449:
446:
441:
439:
436:
434:
430:
426:
422:
417:
410:Impact basins
407:
388:
386:
382:
377:
375:
371:
367:
356:
354:
350:
346:
342:
338:
329:
326:
322:
317:
313:
309:
306:
303:
299:
294:
281:
254:
253:
241:
240:
228:
227:
217:
216:
215:Eratosthenian
206:
205:
193:
192:
180:
179:
178:Pre-Nectarian
74:
69:
64:
58:
53:
48:
43:
38:
32:
25:
22:Pre-Nectarian
20:
1060:
1054:
1030:
1023:
1013:
1006:
989:
980:
946:Basin Groups
925:evidence on
920:
904:
802:
712:
707:
702:
656:
624:Fecunditatis
609:Al-Khwarizmi
607:
591:
575:
559:
543:
532:
520:
503:
486:Tsiolkovskiy
484:
460:
442:
437:
432:
420:
415:
405:
384:
380:
378:
362:
336:
334:
305:Earth's Moon
248:
235:
224:
213:
200:
187:
177:
176:
36:
995:Werner S.C.
942:Cryptic era
461:Procellarum
381:Cryptic Era
370:anorthosite
359:Description
1094:Categories
972:References
938:Hadean eon
923:geological
905:italicized
703:Basin name
433:Basin name
319:Definition
226:Copernican
66:Chronology
950:Nectarian
808:Ganswindt
804:Arnundsen
757:Heaviside
683:Lomonosov
545:Flamsteed
521:Insularum
423:. (1987)
385:Aitkenian
366:Nectarian
353:Nectarian
190:Nectarian
1081:Archived
960:See also
865:Grimaldi
842:Birkhoff
743:Poincaré
708:Diameter
637:Australe
533:Marginis
438:Diameter
387:period.
355:period.
790:Lorentz
780:Smythii
730:Ingenii
687:Fleming
565:Kapteyn
505:Grissom
376:ocean.
339:of the
203:Imbrian
163:–
153:–
143:–
133:–
123:–
113:–
103:–
93:–
83:–
1105:Hadean
931:Hadean
909:
878:Apollo
832:Planck
753:Keeler
724:(nr.)
673:Nubium
597:Hausen
593:Pingré
577:Werner
561:Balmer
479:2,500
466:3,200
454:(nr.)
328:Period
275:
268:
261:
948:1-9,
927:Earth
721:(km)
715:group
662:Vlacq
658:Mutus
549:Billy
509:White
490:Stark
451:(km)
445:group
421:et al
374:magma
251:Early
952:and
882:505
869:430
856:600
846:330
836:325
826:325
813:355
794:360
784:840
771:530
761:780
747:340
734:650
713:Age-
691:620
677:690
667:700
651:800
641:880
628:990
618:590
613:King
602:300
586:500
581:Airy
570:550
554:570
538:580
526:600
514:600
495:700
443:Age-
345:Moon
335:The
238:Late
37:PreN
1040:doi
934:eon
1096::
944:,
872:9
859:8
816:7
797:6
774:5
737:4
631:3
611:/
498:2
469:1
31:Ma
1048:.
1042::
907:.
806:-
755:-
685:-
660:-
595:-
579:-
563:-
547:-
507:-
488:-
57:C
52:E
47:N
42:I
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.