Basal Yorktown Member

Geology

Group: Chesapeake

Formation: Yorktown

Lithologies: not reported (1)

Paleoenvironments: terrestrial indet. (1)

Age range: base of the Nemakit-Daldynian to the top of the Holocene or 538.80000 to 0.00000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Nemakit-Daldynian538.8 - 525.5China (Zhangjiajie) (86661)
St Davids509.0 - 497.0USA (Montana) (212)
Furongian497.0 - 485.4Canada (Alberta) (229379 229380)
Merioneth497.0 - 485.4USA (Utah) (206)
Sunwaptan493.5 - 487.5Canada (Alberta) (11077 11078 11079 11080 11081)
Trempealeauan492.5 - 485.4Canada (Alberta) (54119 54120 54121 203762 203763 203777 203778 203779 203780 203781 203782 203783 203784 203785)
Ibexian487.5 - 470.0Canada (Alberta) (229378)
Tremadoc486.5 - 477.7Canada (Alberta) (11033 11036 11034 11037 11038 11039 11040 11044 11045 11046 11047 11048 11049 11050 11052 11059 11060 11061 11062 11063 11064 11065 11066 11067 11068 11069 11070 11071 11072 11073 11074 11075 11076 54122)
Migneintian485.4 - 478.6United Kingdom (England) (3709)
Tremadocian485.4 - 477.7Canada (Alberta) (229377)
Cassinian482.3 - 470.0Canada (Newfoundland) (154702)
Kirkfieldian457.3 - 449.6USA (Tennessee) (155401)
Richmondian449.6 - 445.5USA (Iowa) (356)
Pragian - Early/Lower Emsian410.8 - 402.5Spain (Leon) (25899 25905 25906)
Emsian407.6 - 393.3France (145068 145069 145070 145071 145072)
Late/Upper Emsian402.5 - 391.9Spain (62194)
Givetian387.7 - 382.7Spain (Leon) (26842 26847)
Givetian387.7 - 382.7Germany (Hagen-Delstern, Sauerland) (23819)
Frasnian382.7 - 372.2Spain (Leon) (26901)
Meramecian343.0 - 335.5USA (Arkansas) (76149 76155)
Meramecian343.0 - 335.5USA (Oklahoma) (76158)
Wuchiapingian259.9 - 254.17China (Sichuan) (29898)
Wuchiapingian - Changhsingian259.9 - 252.17Poland (25971)
Griesbachian251.902 - 250.5Nepal (212435 212436 212437)
Pelsonian247.2 - 242.0Germany (Nordrhein-Westfalen) (196513)
Norian228.0 - 208.5Canada (British Columbia) (107288 107289 107290 107291)
Hettangian - Sinemurian201.3 - 190.8Russian Federation (30636 30649)
Bathonian - Callovian168.3 - 163.5Somalia (100366 100377 100385)
Callovian166.1 - 163.5Somalia (100368 100378 100379 100380 100386 100387 100388)
Albian113.0 - 100.5Ecuador (61911)
Middle Albian109.0 - 105.3Ecuador (61909)
Late/Upper Albian105.3 - 99.6Ecuador (61910)
Late/Upper Campanian83.5 - 70.6USA (New Jersey) (233638)
Maastrichtian72.1 - 66.0USA (Arkansas) (4391)
Early/Lower Maastrichtian70.6 - 66.0USA (Alabama) (4259 4260 4283 4285)
Late/Upper Maastrichtian70.6 - 66.0USA (Alabama) (4181 4207 4208 4237)
Late/Upper Maastrichtian70.6 - 66.0USA (Texas) (4399 4400 4414 4448)
Late/Upper Maastrichtian70.6 - 66.0USA (Mississippi) (4106 4117 4131 4148 4152 4163)
Tiffanian61.7 - 56.8USA (Utah) (14994)
Thanetian59.2 - 56.0United Kingdom (Scotland) (113632)
Graybullian55.8 - 50.3USA (Wyoming) (15878)
Wasatchian55.8 - 50.3USA (Wyoming) (16063 16075)
Bridgerian - Uintan50.3 - 39.7USA (New Mexico) (16252)
Lutetian47.8 - 41.3Egypt (41905)
Bartonian41.3 - 38.0Egypt (41917)
Chadronian37.2 - 33.9USA (Wyoming) (16943)
Arikareean29.5 - 18.5USA (Montana) (17504)
Late/Upper Oligocene - Early/Lower Miocene28.4 - 15.97USA (Washington) (193977)
Harrisonian24.8 - 18.5USA (Nebraska) (17741 17744 17789)
Harrisonian24.8 - 18.5USA (New Mexico) (17844)
Aquitanian23.03 - 20.44Panama (Panama) (159349 159354 159355)
Miocene23.03 - 5.333USA (Nevada) (18857 18858 18859)
Hemingfordian20.43 - 15.97USA (Idaho) (18928)
Hemingfordian20.43 - 15.97USA (Nebraska) (17896)
Barstovian16.3 - 12.5USA (Texas) (18700)
Middle Miocene15.97 - 11.608Ecuador (Guayas) (61075 61076 61077 61093)
Tortonian11.62 - 7.246Spain (Sevilla) (150039)
Hemphillian10.3 - 4.9USA (Texas) (18211)
Hemphillian10.3 - 4.9USA (California) (19365)
Zanclean5.333 - 3.6Ethiopia (107488)
Pliocene - Pleistocene5.333 - 0.0117Ethiopia (22568)
Piacenzian3.6 - 2.588USA (North Carolina) (18550)
Calabrian1.8 - 0.774Tanzania (Lake Natron Basin) (22553 22556 22578 22581)
Holocene0.0117 - 0.0USA (Louisiana) (41936)