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Most diverse localities (taxa):
- Norden Bridge Quarry (72)
- Calf Creek (66)
- Valentine Railway Quarries (60)
- Davis Ranch (58)
- Cochrane 2 (57)
- Cumberland Cave (57)
- Elk Creek (140 m) (52)
- Gidley Quarry (52)
- Lysite (52)
- Pipestone Springs (52)
- Santee (52)
Note: count is of distinct taxa, meaning named species plus genera with no identified species at this locality.
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Most fossiliferous counties (localities):
- Park Co., Wyoming (319)
- Sioux Co., Nebraska (216)
- San Diego Co., California (193)
- Shannon Co., South Dakota (167)
- Riverside Co., California (164)
- Garfield Co., Colorado (153)
- San Bernardino Co., California (129)
- Uinta Co., Wyoming (127)
- Cherry Co., Nebraska (118)
- Sweetwater Co., Wyoming (116)
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Most diverse genera (valid species):
- Spermophilus (40)
- Sorex (24)
- Peromyscus (20)
- Equus (18)
- Merychippus (17)
- Neotoma (17)
- Cupidinimus (16)
- Hyopsodus (16)
- Perognathus (16)
- Entoptychus (14)
- Miacis (14)
- Proheteromys (14)
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Most over-used genera (invalid genus-species combinations):
- Canis (38)
- Mioclaenus (31)
- Paramys (30)
- Pliohippus (30)
- Felis (28)
- Mesohippus (28)
- Promerycochoerus (28)
- Citellus (27)
- Bison (24)
- Eporeodon (24)
- Gomphotherium (24)
- Procamelus (24)
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Most over-named species (junior synonyms):
- Uintatherium anceps (36)
- Merycochoerus superbus (28)
- Gomphotherium obscurum (25)
- Leptauchenia decora (24)
- Gomphotherium willistoni (21)
- Orohippus pumilus (21)
- Bootherium bombifrons (20)
- Mammuthus columbi (18)
- Merycoidodon bullatus (18)
- Leptauchenia major (16)
Note: assorted invalid combinations involving the same synonymous species name are counted separately.
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Most taxonomically debated species (changes of status):
- Hyopotamus brachyrhynchus Osborn & Wortman = Elomeryx armatus (10)
- Canis gregarius Cope = Hesperocyon gregarius (11)
- Hyopotamus americanus Leidy = Aepinacodon americanus (11)
- Machaerodus floridanus Leidy = Smilodon fatalis (11)
- Smilodon gracilis Cope (11)
- Equus idahoensis Merriam (10)
- Ancodus rostratus Scott = Bothriodon rostratus (9)
- Pelycodus angulatus Cope = Cantius angulatus(9)
Note: many names are tied at 8 changes each.
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Most common species (localities):
- Ectocion osbornianus (167)
- Phenacodus intermedius (112)
- Phenacodus vortmani (107)
- Hesperocyon gregarius (101)
- Hyracotherium grangeri (96)
- Viverravus acutus (90)
- Haplomylus speirianus (87)
- Paramys copei (83)
- Didymictis protenus (81)
- Hyopsodus paulus (80)
Note: many of these species are Wasatchian (early Eocene).
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Longest-ranging species (Cenozoic only):
- Centetodon magnus (18.0 my)
- Palaeogale sectoria (15.5 my)
- Copedelphys innominata (13.1 my)
- Hesperocyon gregarius (13.1 my)
- Hypolagus vetus (11.8 my)
- Parvericius montanus (11.8 my)
- Domnina gradata (10.8 my)
- Peratherium comstocki (10.7 my)
- Herpetotherium knighti (10.6 my)
- Paramys copei (10.4 my)
Note: many of these species are small marsupials, rodents, or insectivorans.
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Biggest species (estimated from m1 or m2 size):
- Mammuthus columbi (8,700 kg)
- Brontops dispar (5,100 kg)
- Cuvieronius tropicus (4,600 kg)
- Gomphotherium willistoni (4,200 kg)
- Aphelops mutilus (3,700 kg)
- Rhynchotherium praecursor (3,700 kg)
- Archaeotherium trippensis (3,400 kg)
- Mammut raki (3,400 kg)
- Mammut americanum (3,300 kg)
- Gomphotherium obscurum (3,200 kg)
Notes: regression equations perform poorly for very large species, and some of these estimates are likely to be too high.
Proboscidean sizes are estimated from m2, not m1.
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Smallest species (estimated from m1 size):
- Batodonoides vanhouteni (1.3 g)
- Spalacotheridium noblei (2.6 g)
- Leptodontomys russelli (2.8 g)
- Cupidinimus eurekensis (3.0 g)
- Leptodontomys quartzi (3.1 g)
- Batodonoides powayensis (3.2 g)
- Sorex meltoni (3.5 g)
- Perognathus trojectioansrum (3.7 g)
- Heliscomys ostranderi (4.0 g)
- Spalacolestes cretulablatta (4.1 g)
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Most productive taxonomists (species named/synonymized):
- E. D. Cope (452.5/20)
- W. D. Matthew (214.5/103)
- O. C. Marsh (205/2)
- B. Lander (2/168.5)
- C. L. Gazin (122.5/46)
- J. Leidy (152.5/9)
- G. G. Simpson (108/40.5)
- C. W. Hibbard (123.5/20)
- H. F. Osborn (115/24.5)
- C. Frick (119.5/15)
Note: authors receive half-credit for co-authored actions. Taxonomic contributions of Lander and Frick each appeared mostly in just one publication.
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Most productive faunal reviewers (lists published):
- A. J. Kihm (206)
- K. D. Rose (140.5)
- J. R. Macdonald (121)
- A. F. Pajak (121)
- G. F. Gunnell (116.5)
- J. A. Lillegraven (69)
- T. S. Kelly (64.5)
- M. F. Skinner (62.5)
- G. T. James (61)
- E. H. Lindsay (60)
- M. R. Voorhies (60)
Notes: authors receive half-credit for co-authored lists.
Most of Kihm's lists are from an unpublished Ph.D. thesis.
Most of Skinner's "lists" are locality descriptions with identifications provided by other authors.
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Most papers by an author:
- C. W. Hibbard (77)
- C. Stock (50)
- W. W. Korth (48)
- P. D. Gingerich (43)
- S. G. Lucas (40)
- R. C. Fox (39)
- G. G. Simpson (37)
- E. H. Barbour (36)
- R. W. Wilson (36)
- C. L. Gazin (34)
Note: only senior authors are counted.
Nineteenth-century authors (including Matthew) are excluded.
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Most papers per journal:
- Journal of Vertebrate Paleontology (227)
- Journal of Paleontology (201)
- American Museum Novitates (107)
- American Journal of Science (103)
- Journal of Mammalogy (97)
- Annals of Carnegie Museum (92)
- Bulletin of the American Museum of Natural History (76)
- Contributions from the Museum of Paleontology, University of Michigan (55)
- Carnegie Institution of Washington Publications (54)
- University of Wyoming Contributions in Geology/Rocky Mountain Geology (43)
Note: totals for JVP include numerous abstracts.
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