Barrel Spring Arroyo (Ectoconus Zone) (Paleocene of the United States)

Also known as Coal Creek Canyon; Sinclair and Granger Loc. 2 (in part)

Where: San Juan County, New Mexico (36.3° N, 108.2° W: paleocoordinates 43.2° N, 87.3° W)

• coordinate based on political unit

When: Nacimiento Formation, Puercan (66.0 - 63.3 Ma)

• low in a normal magnetic polarity zone in the Barrel Spring Arroyo = De-na-zin Wash section interpreted as C29n based on the position of the K-T boundary in the section: see Butler et al. 1977, Lucas et al. 1997

• member-level stratigraphic resolution

Environment/lithology: terrestrial

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 14661: authorized by John Alroy, entered by John Alroy on 30.04.1994

Creative Commons license: CC BY (attribution)

Taxonomic list

• multiple records omitted by Williamson and Lucas 1993
identical to list 7 of Williamson 1996
underlies Taeniolabis Zone
in a normal paleomag interval that must represent chron 29N because the K-T is in a reversed interval at the base of the section
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Mammalia
 Theriamorpha - Periptychidae
Periptychidae indet.1, Periptychus sp.1, Ectoconus ditrigonus1, Conacodon sp.2, Hemithlaeus sp.2
Periptychidae indet.1 Cope 1882 condylarth
Periptychus sp.1 Cope 1881 condylarth
Ectoconus ditrigonus1 Cope 1882 condylarth
Conacodon sp.2 Matthew 1897 condylarth
Hemithlaeus sp.2 Cope 1882 condylarth
1Alroy 2002; 2Butler et al. 1977