The Basin Groups Period

The Geological Timescale Versus Radiometric Dating

By Paul Nethercott
October 2014

The Basin Groups Period

4,500 To 4,567 Million Years Ago

1. Age of Meteorites and the Earth,

Geochimica et Cosmochimica Acta, 1956, Volume 10, Pages 230 to 237

207Pb/206Pb

4,717

4,970

4,938

5,354

5,362

2. The Solar System Primordial Lead,

Earth and Planetary Science Letters, Volume 300 (2010), Pages 152-163

Pb207/Pb206	Pb207/Pb206	Pb207/Pb206	Pb207/Pb206
5,381	5,377	5,345	5,139
5,381	5,377	5,330	5,119
5,381	5,376	5,328	5,103
5,380	5,376	5,322	5,098
5,380	5,374	5,303	5,097
5,380	5,374	5,294	5,096
5,380	5,373	5,283	5,086
5,380	5,372	5,275	5,079
5,380	5,372	5,260	5,072
5,380	5,371	5,222	5,052
5,379	5,371	5,221	5,040
5,379	5,370	5,221	5,039
5,379	5,370	5,193	5,035
5,379	5,368	5,189	5,030
5,379	5,367	5,183	5,011
5,378	5,367	5,161	5,009
5,378	5,354	5,148	4,966
5,378	5,351	5,147	4,965

3. Gerontology Of The Allende Meteorite,

Nature, 1979, Volume 277, Pages 554 - 556

40Ar/39Ar	40Ar/39Ar	40Ar/39Ar
11,010	5,210	4,900
8,060	5,190	4,900
7,680	5,130	4,900
7,500	5,120	4,890
7,200	5,090	4,890
6,310	5,080	4,820
6,210	5,080	4,820
6,050	4,990	4,600
5,830	4,970	4,520
5,540	4,970	4,470
5,500	4,970	2,670
5,430	4,970	1,460
5,370	4,970
5,370	4,970
5,370	4,970
5,350	4,960
5,340	4,960
5,340	4,960
5,250	4,900
5,210	4,900

4. 39Ar/40Ar Systematics Of Allende Inclusions,

http://www.lpi.usra.edu/meetings/lpsc1980/pdf/1155.pdf

Bulk	Chondrule	Matrix	Rim	Spinel	Vein
5,120	4,760	3,350	4,020	6,900	8,500
5,100	4,630	1,580	4,180	6,400	5,250
4,680	4,370	1,440			4,880
4,800	4,440	3,640			4,330
4,400	3,970	3,990
4,300	4,400
	4,440
	4,090

5. Eagles Nest And Lewis Cliff 88763,

Meteoritics And Planetary Science, 1998, Volume 33, Pages 31-48

Ar40/Ar39	Ar40/Ar39
5,845	1,393
4,840	1,312
4,160	1,240
3,900	1,030
2,590	955
1,880	701
1,750	650
1,488	615

6. U-Th-Pb Systematics In Lunar Highland Samples,

Earth And Planetary Science Letters, Volume 17 (1972), Pages 36-51

Sample	207Pb/206Pb	206Pb/238U	207Pb/235U	208Pb/232Th
22001, 1A2	4,940	5,830	5,190	5,870
	5,000	5,200	5,060	5,010
	4,920	6,090	5,240	6,240
22001, 1A2	4,960	5,780	5,190	6,080
	5,010	5,250	5,080	5,300
	4,950	5,830	5,200	6,140
67481, 26	4,920	5,490	5,080	5,800
	4,940	5,290	5,040	5,520
	4,920	5,510	5,090	5,840
64421, 29	4,910	5,410	5,050	5,470
	4,940	5,000	4,960	4,910
	4,900	5,430	5,060	5,500
60501, 31	4,980	5,350	5,080	5,260
	4,990	5,230	5,060	5,100
	4,970	5,360	5,090	5,280
68501, 52	5,050	5,610	5,210	5,550
	5,060	5,480	5,180	5,370
	5,050	5,620	5,210	5,560
60025, 65	4,640	6,640	5,180	5,640
	4,750	3,750	4,420	2,510
	4,620	7,830	5,450	7,210

7. 40Ar/39Ar And U-Th-Pb Dating,

Earth and Planetary Science Letters, 1983, Volume 62, Pages 132 - 146

Pb207/Pb206	Pb207/Pb206	40Ar/39Ar	40Ar/39Ar
4,560	5,370	8,900	4,390
4,720	5,364	7,200	4,390
4,560	5,364	5,400	4,380
4,450	5,283	4,800	4,380
4,700	5,371	4,540	4,330
4,540	5,367	4,530	4,310
4,410	5,082	4,520	4,290
4,560	5,368	4,520	4,270
4,700	5,367	4,520	4,150
4,500	5,333	4,500	4,130

8. Potassium/Argon age of Iron Meteorites,

Geochemica Et Cosmochemica Acta, 1958, Volume 15, Pages 40 - 50

Meteorite Sample	K/Ar Million Years
Mt. Ayliff	6,900
Arispe	6,800
H. H. Ninninger	6,900
Carbo	8,400
Canon Diablo I	8,500
Canon Diablo I	6,900
Canon Diablo I	6,600
Canon Diablo I	5,300
Canon Diablo II	13,000
Canon Diablo II	11,000
Canon Diablo II	10,500
Canon Diablo II	12,000
Toluca I	5,900
Toluca I	7,100
Toluca II	10,000
Toluca II	10,800
Toluca II	8,800

9. The age of Dar al Gani 476,

Geochimica Et Cosmochimica Acta, 2003, Volume 67, Number 18, Pages 3519-3536

87Rb/86Sr

-20,004

-15,405

-10,980

-10,117

-6,284

-5,173

-5,082

-2,142

10. History Of The Acapulco Meteorite,

Geochemica Et Cosmochemica Acta, 1997, Volume 61, Number 16, Pages 3477 - 3501

40Ar/39Ar	40Ar/39Ar
11,284	4,511
11,421	4,559
8,534	4,590
6,949	4,580
4,083	4,521
3,892	4,522
4,112	4,531
4,376	4,521
4,564	4,514
4,480	4,519
4,460	4,515
4,506	4,501
4,513	4,502
4,513	4,508
4,521	4,459
4,518	4,402
4,502	4,324
4,516	4,306
4,506	3,481

11. Constraints on Martian Differentiation Processes,

Geochimica et Cosmochimica Acta, 1997, Volume 61, Number 22, Pages 4915-4931

87Rb/86Sr	87Rb/86Sr
4,642	328
4,094	320
1,765	316
1,691	303
1,656	246
453	-98
389	-812
362	-98,394
351	-118,922
336

12. Pb-Isotopic Dates From Estacado,

Meteoritics & Planetary Science, 2007, Volume 42, Numbers 7/8, Pages 1337 - 1350

Pb207/U235	Pb206/U238	Pb207/Pb206
20	6,481	5,023
11	4,250	5,017
11	4,092	4,930
11	4,046	4,924
10	3,979	4,921
10	3,963	4,916
10	3,894	4,914
10	3,827	4,913
10	3,785	4,906
10	3,681	4,903
9	3,654	4,901
9	3,604	4,872
9	3,561	4,848
9	3,549	4,827
8	3,508	4,819
8	3,481	4,714
8	3,252	4,691
8	3,191	4,658
8	3,185	4,654
7	3,011	4,649
7	2,911	4,640
7	2,857	4,636
7	2,779	4,626
6	2,351	4,625
5	2,350	4,611
5	2,323	4,611
4	1,828	4,600
4	1,732	4,592
3	1,242	4,569
2	1,072	4,562

13. 40Ar/39Ar Ages of Allende,

Icarus, 1980, Volume 42, Pages 380 - 405

40Ar/39Ar	40Ar/39Ar	40Ar/39Ar	40Ar/39Ar
7,460	5,004	4,811	4,703
5,812	4,963	4,799	4,703
5,784	4,943	4,776	4,692
5,706	4,939	4,775	4,692
5,641	4,919	4,770	4,691
5,590	4,914	4,766	4,690
5,331	4,913	4,762	4,686
5,235	4,901	4,762	4,681
5,233	4,886	4,756	4,679
5,223	4,884	4,744	4,673
5,216	4,875	4,735	4,671
5,192	4,871	4,734	4,671
5,168	4,870	4,726	4,668
5,135	4,869	4,724	4,667
5,113	4,865	4,721	4,667
5,085	4,861	4,716	4,665
5,067	4,848	4,715	4,663
5,050	4,835	4,712	4,658
5,049	4,824	4,707	4,653

14. Pt-Re-Os Systematics,

Geochimica et Cosmochimica Acta, Volume 68, Number 6, Pages 1413–1431, 2004

187Os/188Os	187Os/188Os
-10,233	-2,694
-7,625	-2,616
-7,227	-2,531
-6,528	-2,294
-6,163	-2,289
-6,158	-2,287
-6,151	-2,050
-5,448	-1,737
-5,340	-1,671
-5,232	-1,557
-3,995	-1,504
-3,891	-1,448
-3,838	-1,263
-3,779	-1,261
-3,741	-1,212
-3,697	-1,079
-3,689	-950
-3,179	-808
-3,178	3
-2,880	114
-2,804	296
-2,789

15. Argon-39/Argon-40 Ages,

Meteoritics And Planetary Science, 2001, Volume 36, Pages 107 - 122

1. Monahans Light	2. Monahans Dark	3. Monahans Halite
4,619	8,058	5,745
4,542	4,714	4,330
4,534	4,582	4,204
4,534	4,503	4,124
4,534	4,495	3,824
4,531	4,483	2,250
4,529	4,481	1,965
4,524	4,469	1,324
4,522	4,456	1,102
4,521	4,450
4,503	4,434
4,498	4,430
4,488	4,425
4,473	4,418
4,427	4,417
4,384	4,304
4,346	4,089
4,343	4,043
4,322	3,954
4,315	3,942
4,206	3,939
4,090	3,916
4,069	3,899
4,058
4,017
3,825
3,740
2,503

16. 182W and 187Re/187Os Systematics of Iron Meteorites,

Geochimica et Cosmochimica Acta, Volume 62, Number 3, Pages 545–554, 1998

Meteorite	187Os/188Os
Osseo	529
Osseo	420
Magura	318
Yenberrie	238
Seligman	-88
New Leipzig	-1,255
New Leipzig	-1,384
Sardis	-1,865
Sardis	-2,009
Canyon Diablo	-1,260
Canyon Diablo	-1,371
Shrewsbury	922
Seelasgen	-2,662

17. Ar39/Ar40 Dating of Inclusions From IAB Iron Meteorites,

Geochemica Et Cosmochemica Acta, 1979, Volume 43, Pages 1829 - 1840

Landes	Copiapo	Woodbine	Mund Silicate	Unetched Pitts	Etched Pitts	Mund Troillte
7,087	5,888	9,588	7,732	7,470	7,150	5,352
6,005	5,533	7,529	6,702	6,007	6,979	4,223
5,258	5,083	6,734	6,078	5,987	4,426	3,873
4,623	5,059	5,507	5,241	5,042	2,206	1,828
4,111	4,557	5,376	4,654	4,950	1,073	1,538
4,070	3,377	5,338	4,613	4,818	978	753
3,863	1,065	5,313	3,994	3,388	656	-308
2,199	-129	5,234	2,609	2,904	391	-413
1,661	-162	5,160	1,835	1,830	91	-615
1,457	-1,165	4,431	1,806	1,418
942		3,776	959	941
911		3,195	-569	695
-1,069		2,862		-457
-1,399		2,364		-479
-2,416		1,450		-1,039
		484

18. The Allende and Orgueil Chondrites,

Geochemica Et Cosmochemica Acta, 1976, Volume 40, pages 617 - 634

Pb206/U238	Pb207/U235	Pb207/Pb206	Pb208/Th232
9,860	5,780	4,569	16,490
8,950	5,600	4,568	14,400
8,820	5,570	4,567	11,700
7,820	5,360	4,562	10,400
7,800	5,340	4,557	10,400
7,750	5,340	4,554	10,100
6,660	5,100	4,554	9,860
6,500	5,050	4,553	9,550
6,500	5,040	4,552	9,150
6,440	5,040	4,547	7,520
6,420	5,030	4,546	6,990
6,350	5,020	4,544	6,400
6,330	4,990	4,540	5,440
6,050	4,960	4,538	5,350
5,730	4,890	4,533	5,150
5,730	4,880	4,533	4,810
5,690	4,860	4,528
5,500	4,820	4,524
5,450	4,810	4,521
5,440	4,790	4,518
5,340	4,780	4,506
5,070	4,700	4,503
5,040	4,700	4,497
5,020		4,496
5,010		4,495
4,960		4,494
4,920		4,492
		4,489
		4,488
		4,483
		4,481
		4,467

19. The Tagish Lake Carbonaceous Chondrite,

Geochimica et Cosmochimica Acta, Volume 69, Number 6, Pages 1619–1631, 2005

187Os/188Os

-467

-448

-332

-322

-281

-274

-207

-204

-199

-170

-161

-160

-130

-78

20. The Unique Achondrite Ibitira,

Geochimica et Cosmochimica Acta, Volume 132 (2014), Pages 259–273

207Pb/235U	207Pb/235U	206Pb/238U	206Pb/238U	207Pb/206Pb	207Pb/206Pb
5,131	4,765	6,676	5,264	4,672	4,557
5,639	4,750	8,949	5,249	4,635	4,557
5,610	4,750	8,739	5,215	4,631	4,556
5,608	4,749	8,722	5,214	4,614	4,556
5,566	4,746	8,627	5,209	4,608	4,556
5,438	4,697	7,901	5,037	4,607	4,556
5,353	4,642	7,539	4,830	4,604	4,556
5,285	4,635	7,419	4,821	4,589	4,556
5,228	4,620	7,083	4,761	4,588	4,556
5,081	4,617	6,425	4,726	4,584	4,556
5,056	4,606	6,383	4,698	4,584	4,555
5,044	4,603	6,377	4,693	4,582	4,554
5,030	4,597	6,303	4,638	4,582	4,553
5,010	4,572	6,182	4,604	4,573	4,553
4,970	4,522	6,060	4,495	4,571	4,553
4,955	4,486	5,955	4,259	4,564	4,552
4,906	4,392	5,781	4,077	4,563	4,552
4,857	4,357	5,586	3,839	4,563	4,552
4,853	4,227	5,586	3,539	4,561	4,551
4,851	4,172	5,499	3,315	4,560	4,546
4,831	4,060	5,452	3,084	4,559	4,539
4,812	3,943	5,436	2,669	4,558	4,538
4,805	3,874	5,407	2,582	4,558	4,536
4,792	3,811	5,399	2,519	4,558	4,533
4,779	2,526	5,377	871	4,557	4,527
4,775		5,305		4,557	4,523

21. Age and Isotopic Relationships,

Geochimica et Cosmochimica Acta, 1992, Volume 56, Pages 1673-1694

87Rb/86Sr	207Pb/206Pb	207Pb/206Pb	147Sm/144Nd	147Sm/144Nd
4,518	5,000	5,011	781	4,452
4,546	5,002	5,013	536	4,397
4,562	4,801	5,010	1,428	4,497
4,610	4,802	5,012	906	4,452
4,546	4,802	5,005	861	4,463
4,546	4,975	5,007
4,546	4,977	5,006
4,576	4,633	5,008
	4,635	4,960
	4,631	4,961
	4,590	4,980
	4,592	5,110
	4,591
	4,572
	4,573
	4,573
	4,558
	4,560
	4,560

22. U-Pb ages of Angrites,

Geochemica Et Cosmochemica Acta, 2008, Volume 72, Pages 221 - 232

Meteorite Sample	Pb206/U238
Angra dos Reis
4W3	5,535
5W3	5,658
Lewis Cliff 86010
10W3a	6,072
11W3	6,625
D’Orbigny
15R	4,842
16Ra	4,893
17R	4,695
18R	4,972
19R	5,080
20R	4,957
21W3	5,471
22W3	5,291
23W3	5,568

23. Rhenium/Osmium Systematics,

Geochimica et Cosmochimica Acta, Volume 65, Number 19, Pages 3379–3390, 2001

187Os/188Os	187Os/188Os
-2,052	-225
-2,034	-220
-1,774	-215
-1,435	-210
-1,047	-209
-562	-206
-328	-202
-327	-202
-292	-201
-284	-197
-269	-188
-268	-171
-246	-142
-243	-137
-242	-135
-233	1
-232	169
-225	624

24. Comparative 187Re/187Os Systematics of Chondrites,

Geochimica et Cosmochimica Acta, Volume 66, Number 23, Pages 4187–4201, 2002

187Os/188Os	187Os/188Os	187Os/188Os	187Os/188Os	187Os/188Os
-50,818	-590	-466	-279	-70
-47,880	-557	-464	-266	-53
-873	-551	-453	-232	-44
-865	-551	-453	-225	-40
-846	-551	-441	-225	-30
-826	-546	-438	-222	-29
-746	-544	-425	-217	-16
-742	-543	-413	-212
-739	-538	-402	-209
-739	-531	-394	-209
-733	-521	-386	-207
-728	-518	-351	-199
-716	-517	-351	-191
-690	-505	-345	-178
-670	-499	-341	-170
-664	-492	-341	-161
-629	-492	-340	-160
-623	-485	-338	-153
-611	-482	-335	-147
-610	-479	-330	-107

25. Abundances in Chondritic Meteorites,

Geochimica et Cosmochimica Acta, Volume 74 (2010), Pages 356–379

187Os/188Os	187Os/188Os	187Os/188Os
-12,248	-242	-137
-12,248	-225	-137
-1,253	-212	-130
-896	-212	-130
-839	-209	-129
-636	-199	-127
-636	-199	-127
-623	-176	-124
-551	-173	-124
-543	-171	-122
-535	-171	-122
-463	-161	-122
-440	-160	-120
-438	-158	-91
-436	-158	-86
-435	-152	-17
-425	-143	-6
-392	-143	1,284
-353	-143	9,029
-287	-137	13,939

26. Presolar Ages In Allende Inclusions,

Earth and Planetary Science Letters, 1983, Volume 63, Pages 1 To 12

40Ar/39Ar	40Ar/39Ar
8,880	4,800
7,370	4,730
6,450	4,670
5,930	4,570
5,660	4,510
5,190	4,470
5,070	4,470
5,020	3,430
4,860	2,990

27. Osmium Isotope Systematics,

Geochimica et Cosmochimica Acta, Volume 71 (2007), Pages 2402–2413

187Os/188Os	187Os/188Os
-821	-145
-500	-143
-430	-137
-355	-124
-328	-122
-317	-94
-310	-81
-297	-71
-260	-47
-256	71
-214	76
-209	282
-197	629
-189	660
-163	1,272
-155

28. Precise U-Pb Dating of Chondrites,

Geochemica Et Cosmochemica Acta, 2005, Volume 69, Number 2, Pages 505 - 518

Pb206/U238	Pb207/U235	Pb208/Th232	Pb207/Pb206
6,473	5,013	5,127	4,554
5,519	4,837	4,980	4,555
5,165	4,743	4,683	4,553
4,845	4,646	4,626	4,560
4,724	4,612	4,619	4,552
4,647		4,607	4,459
4,643		4,604	4,567
4,628		4,600	4,564
4,625			4,561

29. Age of the MET 78008 Ureilite,

Geochimica et Cosmochimica Acta, 1995, Volume 59, Number 11, Pages 2319-2329

207Pb/206Pb	206Pb/238U	208Pb/232Th
5,327	30,179	90,595
5,241	26,671	80,626
5,170	25,513	76,308
5,166	22,878	73,746
5,121	22,733	71,804
5,118	22,179	63,552
5,074	21,253	62,693
5,068	20,785	46,684
5,050	18,216	40,862
5,046	17,870	30,566
5,041	16,929	24,290
5,032	16,667	23,011
5,031	16,198	22,760
5,029	16,156	20,473
5,011	10,859	16,837
5,005	10,851	14,271
4,992	9,469
4,972	9,176
4,963	9,026
	8,866
	8,346
	8,202
	7,496
	6,604
	5,849
	5,512
	5,188
	5,067

30. Pb-Pb Dating Of Chondrules,

Chemical Geology, 2009, Volume 259, Pages 143 - 151

Pb207/Pb206	Pb207/Pb206
5,206	4,876
5,194	4,857
5,190	4,832
5,174	4,820
5,094	4,814
5,091	4,813
5,089	4,806
5,063	4,800
5,051	4,798
5,050	4,794
5,032	4,778
5,021	4,774
5,020	4,773
5,013	4,767
5,002	4,766
4,985	4,766
4,981	4,760
4,974	4,733
4,961	4,677
4,922	4,650
4,910	4,577

31. Isotopic Lead Investigations,

Geochimica et Cosmochimica Acta, 1976, Volume 40, Pages 635 - 643

Sample	Pb206/Pb207	Age Category
7-1	5,175	Older Than Solar System
7-2	5,300	Older Than Solar System
7-3	5,287	Older Than Solar System
7-4	5,346	Older Than Solar System
4-1	5,337	Older Than Solar System
W-2	5,342	Older Than Solar System
Allende-1	5,297	Older Than Solar System
Allende-2	5,326	Older Than Solar System
Allende	5,262	Older Than Solar System
9-1	5,324	Older Than Solar System
M-2	5,322	Older Than Solar System
9-3	5,339	Older Than Solar System
9-4	5,334	Older Than Solar System
ChL-1 (IC)	5,138	Older Than Solar System
ChL-1 (ID)	5,137	Older Than Solar System
C9L-2 (IC)	4,875	Older Than The Earth
C6L-2 (10)	4,904	Older Than The Earth
Ch3 (IC)	5,220	Older Than Solar System
Ch3 (ID)	5,227	Older Than Solar System
ChD (IC)	5,103	Older Than Solar System
ChD (ID)	5,099	Older Than Solar System
WI (IC)	4,875	Older Than The Earth
WI (10)	4,872	Older Than The Earth

32. The Allende Carbonaceous Chondrite,

Geochemica Et Cosmochemica Acta, 1976, Volume 40, Pages 635 - 643

Sample	Pb206/U238	Pb207/U235	Pb207/Pb206	Pb208/Th232
ChL-1	5,104	4,730	4,573	3,328
ChL-2	4,688	4,615	4,583	4,622
Ch 3	3,312	4,114	4,533	3,271
ChR	4,410	4,619	4,568	3,862
WI	4,023	4,385	4,555	3,773
WA	4,349	4,496	4,562	4,391
PI	4,644	4,583	4,556	4,063

33. Pb Isotopic age of the Allende Chondrules,

Meteoritics And Planetary Science, 2007, Volume 42, Numbers 7/8, Pages 1321 - 1335

Pb206/U238	Pb207/Pb206	Pb207/Pb206
10,066	4,587	4,566
6,945	4,577	4,565
5,956	4,575	4,565
5,604	4,574	4,565
5,526	4,571	4,565
5,462	4,570	4,565
5,396	4,570	4,565
5,345	4,569	4,564
5,336	4,568	4,564
5,180	4,568	4,564
5,147	4,568	4,563
4,950	4,568	4,563
4,879	4,568	4,563
4,875	4,568	4,563
4,850	4,567	4,562
4,842	4,567	4,561
4,824	4,567	4,561
4,798	4,566	4,560
4,791	4,566	4,559
4,756	4,566	4,558
4,733	4,566	4,555
4,659	4,566	4,553
4,614	4,566	4,551

34. Angrite Sahara 99555,

Geochimica et Cosmochimica Acta, Volume 72 (2008), Pages 4874–4885

207Pb/235U	206Pb/238U	Pb207/Pb206	Pb207/Pb206
4,758	5,224	4,567	4,568
4,755	5,214	4,567	4,568
4,753	5,207	4,567	4,568
4,740	5,161	4,566	4,566
4,739	5,160	4,566	4,566
4,708	5,048	4,565	4,566
4,701	5,026	4,565	4,566
4,687	4,978	4,565	4,565
4,686	4,975	4,565	4,565
4,672	4,924	4,565	4,565
4,670	4,915	4,564	4,565
4,657	4,875	4,564	4,565
4,597	4,672	4,564	4,565

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