Chico Springs (Paleocene of the United States)

Also known as NMMNH 1226, 2513, 2543, 2544, 2545, 2546, 2547, 2548, 2549; Sinclair and Granger Loc. 1

Where: San Juan County, New Mexico (36.3° N, 108.2° W: paleocoordinates 42.9° N, 88.3° W)

• coordinate based on political unit

When: Nacimiento Formation, Torrejonian (63.3 - 61.7 Ma)

• low in a reversed magnetic polarity zone correlated with the Barrel Spring Arroyo = De-na-zin Wash section interpreted as C28r based on the position of the K-T boundary in that section: see Butler et al. 1977, Lucas et al. 1997

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Primary reference: T. E. Williamson and S. G. Lucas. 1993. Paleocene vertebrate paleontology of the San Juan Basin, New Mexico. New Mexico Museum of Natural History Bulletin 2:105-136 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 14824: authorized by John Alroy, entered by John Alroy on 30.04.1994

Creative Commons license: CC BY (attribution)

Taxonomic list

• above Head of Barrel Spring Arroyo
identical to list 10 of Williamson 1996
list of Williamson and Lucas 1997 repeats a subset of earlier list
I suspect this is on the divide between Gallegos Canyon and De-Na-Zin wash because it is referred to by both names by Williamson 1996
just above part of local section of known paleomag polarity
omits multis
Mammalia
 Condylarthra - Hyopsodontidae
"Promioclaenus lemuroides" = Ellipsodon lemuroides Matthew 1897 condylarth
Ellipsodon inaequidens Cope 1884 condylarth
"Protoselene opisthacus" = Mioclaenus opisthacus Cope 1882 condylarth
Mioclaenus turgidus Cope 1881 condylarth
Promioclaenus acolytus Cope 1882 condylarth
 Tribosphenida - Periptychidae
Periptychus carinidens Cope 1881 condylarth
Haploconus angustus Cope 1881 condylarth
Anisonchus sectorius Cope 1881 condylarth
 Amblypoda - Pantolambdidae
Pantolambda intermedium Simpson 1935 pantodont
 Tribosphenida - Phenacodontidae
Tetraclaenodon puercensis Cope 1881 condylarth
 Ferae - Viverravidae
Protictis haydenianus Cope 1882 placental
 Taeniodonta - Stylinodontidae
Psittacotherium multifragum Cope 1882 taeniodont
 Tribosphenida - Arctocyonidae
Deuterogonodon noletil Van Valen 1978 condylarth
figured by Van Valen 1988
"Mimotricentes subtrigonus" = Tricentes subtrigonus Cope 1881 condylarth
Chriacus baldwini Cope 1882 condylarth
 Acreodi - Triisodontidae
Triisodon crassicuspis Cope 1882 eutherian
Triisodon quivirensis Cope 1881 eutherian
Goniacodon levisanus Cope 1883 eutherian
 Hyaenodonta - Hyaenodontidae
Deltatherium fundaminis Cope 1881 eutherian
 Multituberculata - Taeniolabididae
Catopsalis fissidens Cope 1884 multituberculate
NMMNH 2543 DUPLICATE REF 2294 or 2295 or 2314 or 2319; NMMNH P-63938 and NMMNH P-62373 (Williamson et al. 2015)