San Jon (Upper Brown Horizon) (Cretaceous of the United States)

Where: Quay County, New Mexico (35.1° N, 103.3° W: paleocoordinates 33.7° N, 62.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Tucumcari Formation, Albian (113.0 - 100.5 Ma)

• several beds within 1.5-2.0 m

• group of beds-level stratigraphic resolution

Environment/lithology: shoreface; brown, gray shale and siltstone

• "open bay to lower to upper shoreface environments"
• "1.5-2.0 m of light brown to grayish-brown shale, siltstone, and a 0.3-m-thick sandstone ledge"

Size class: macrofossils

Primary reference: B. S. Kues. 1997. New bivalve taxa from the Tucumcari Formation (Cretaceous, Albian), New Mexico, and the biostratigraphic significance of the basal Tucumcari fauna. Journal of Paleontology 71(5):820-839 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 37562: authorized by John Alroy, entered by John Alroy on 16.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Pectinoidae
 Pectinida - Plicatulidae
 Ostreida - Gryphaeidae
 Ostreida - Ostreidae
Peilinia levicostata n. gen. Kues 1997 oyster