Also known as Bentonnie Tsosie Arroyo/Wash; Betonnie-Tsosie Arroyo; Bitonitsoseh Arroyo; Eduardo Arroyo; Nameless Arroyo; Sinclair and Sinclair and Granger Loc. 7; Tsosie Hill; NMMNH locality L-646; L-0646; UCMP V-2811, V-3860; UNM B77-7
Where: San Juan County, New Mexico (36.3° N, 108.2° W)
• Paleocoordinates: 47.4° N, 76.0° W (Wright 2013)
• coordinate based on political unit
• outcrop-level geographic resolution
When: Nacimiento Formation, Puercan (66.0 - 63.3 Ma)
• underlies Middle ("Upper") Kimbetoh
•from an interval about 8 to 16 m above the Ojo Alamo-Nacimiento contact that is entirely of normal polarity and therefore almost certainly represents chron C29n: Lindsay et al. 1981; this interval is just below the middle of the normal zone
• member-level stratigraphic resolution
Environment/lithology: terrestrial; lithology not reported
Size class: mesofossils
Collection methods: bulk, sieve
Primary reference: T. E. Williamson. 1996. The beginning of the age of mammals in the San Juan Basin, New Mexico; biostratigraphy and evolution of Paleocene mammals of the Nacimiento Formation. New Mexico Museum of Natural History and Science Bulletin 8:1-141 [J. Alroy/J. Alroy/P. Mannion]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 14760: authorized by John Alroy, entered by John Alroy on 30.04.1994, edited by K. Christopher Beard
Creative Commons license: CC0 (CC0)
Taxonomic list
Williamson's list 16
although Williamson omits multis, they were described by Sloan 1981
following localities could be from either arroyo: LACM 5090, 5091, 5092, 5394, 5395, 5396; UALP 7631
Williamson and Lucas state that UCMP V-2811, 2813, and 3861 are in Barrel Spring Arroyo, but I consider it likely this is a lapsus
Lucas et al. 1981 claim that MH "Tetraclaenodon" and "pantodont" i.d.s of Rigby and Lucas 1981 are in error
a single interval of less than 8 m according to Lindsay et al. 1981
"? Procerberus sp." and new leptictid "A" are present only at Black Toe (see)
"Desmatoclaenus protogonioides" and "D. dianae" of Williamson and Lucas 1993 are actually from East Flank of Kimbetoh Arroyo (see)
| Mammalia | |
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Thylacodon pusillus Matthew and Granger 1921 marsupial AMNH 58230, right m2 or 3, left M1, partial M2 or 3
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Oxyclaenus simplex Cope 1884 condylarth
Oxyclaenus cuspidatus Cope 1884 condylarth
Loxolophus kimbetovius Matthew 1937 condylarth | |
Hemithlaeus kowalevskianus, Conacodon cophater, Conacodon kohlbergeri n. sp., Oxyacodon agapetillus9, Oxyacodon priscilla, Oxyacodon apiculatus, Escatepos campi n. sp., Ectoconus ditrigonus, Periptychus coarctatus, "Conacodon entoconus" = Haploconus entoconus, Mithrandir gillianus1
Hemithlaeus kowalevskianus Cope 1882 condylarth includes "H. sp." of Lindsay et al. 1978 from KA and MH
Conacodon cophater Cope 1884 condylarth
Conacodon kohlbergeri n. sp. Archibald et al. 1983 condylarth from BLM loc. 1711 and "3 mi. E of Kimbetoh" according to Archibald et al. 1983b; presumably includes "C. sp." of Lindsay et al. 1978 from KA and MH
Oxyacodon priscilla Matthew 1937 condylarth found at KA "Ectoconus Zone" and UCMP V-2811, 3860: Archibald et al. 1983b
Ectoconus ditrigonus Cope 1882 condylarth presumably includes "E. sp." of Lindsay et al. 1978 from MH; "E. majusculus" reported at lower Kimbetoh Arroyo by Simpson 1941e
Periptychus coarctatus Cope 1883 condylarth presumably includes "Carsioptychus sp." of Lindsay et al. 1978 from MH
"Conacodon entoconus" = Haploconus entoconus Cope 1882 condylarth | |
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Eoconodon sp. Matthew and Granger 1921 placental said to be new; "E. cf. copanus" from NMMNH 317 near MH
Eoconodon ginibitohia n. sp.2 Clemens and Williamson 2005 placental from NMMNH loc. 317 "in the vicinity of Mammalon Hill"
Eoconodon gaudrianus Cope 1888 placental
Eoconodon coryphaeus Cope 1885 placental | |
Tiznatzinia vanderhoofi, "Bomburia priscus" = Bomburodon priscus, "Platymastus palantir n. sp." = Bomburodon priscus9, Valenia wilsoni3, Choeroclaenus turgidunculus, Bubogonia bombadili n. sp.
Choeroclaenus turgidunculus Cope 1888 condylarth | |
"Cimolestes simpsoni n. sp." = Puercolestes simpsoni, "Puercolestes simpsoni" = Puercolestes simpsoni10, Betonnia tsosia n. gen. n. sp.10
"Cimolestes simpsoni n. sp." = Puercolestes simpsoni Reynolds 1936 eutherian see Reynolds 1936: S & G Loc. 7
"Puercolestes simpsoni" = Puercolestes simpsoni10 Reynolds 1936 eutherian "Genus B"; "? cf. Ictidopappus" of MacIntyre 1966; MH; discussions of Fox and Youzwyshyn 1994 and Williamson 1996 are compatible with Van Valen's identification
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Onychodectes tisonensis5 Cope 1888 taeniodont KA and MH; not clear why this is omitted by Williamson 1996
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Eucosmodon primus n. sp.7
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Catopsalis foliatus4 Cope 1882 multituberculate one specimen of "Eucosmodon primus" from MH, see Granger and Simpson 1929; also discussed by Lucas et al. 1997; type is from the "Hemithlaeus Zone" somewhere in the San Juan Basin, see Sloan 1981
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Kimbetohia campi n. gen. n. sp.6 Simpson 1936 multituberculate UCMP 31305 - holotype (skull fragment with left P2–4 and partial right P1); referred material: four isolated P4s (Sloan, 1981)
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| Reptilia | |
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"Proxestops jepseni" = Proxestops silberlingii8 Gilmore 1938 squamates AMNH and LACM specimens from "Tsosie Wash/Mammalon Hill"
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