Yale Point, AZ (A5-1) (Cretaceous of the United States)

Where: Navajo County, Arizona (36.3° N, 109.8° W: paleocoordinates 37.5° N, 72.9° W)

• small collection-level geographic resolution

When: Sciponoceras Ammonite zone, Mancos Shale Formation, Cenomanian (100.5 - 93.9 Ma)

• Upper Cenomanian.

Bed horizon is the sample number not the lithologic unit number. The lithologic unit numbers that correspond to the sample numbers given can be found in reference for collection (Elder, 87).

• bed-level stratigraphic resolution

Environment/lithology: lithified, nodular, gray, silty, calcareous shale

• Dark olive gray, moderately indurated, with a limestone nodule band approx. middle of sample.

Note: Section A5 constitutes interbedded limestones and shales, but this sedimentary structure is not reflected in the descriptions of each collection, as each is often a single bed, or a portion thereof.

Size class: macrofossils

Collection methods: bulk, mechanical,

• Bulk sample disaggregated in lab.

Primary reference: W. P. Elder. 1987. The paleoecology of the Cenomanian-Turonian (Cretaceous) stage boundary extinctions at Black Mesa, Arizona. Palaios 2(1):24-40 [C. Marshall/S. Low/A. Clement]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 3075: authorized by Charles Marshall, entered by Sofy Low on 23.07.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Baculitidae
Sciponoceras sp.
Sciponoceras sp. Hyatt 1894 ammonite
Bivalvia
 Lucinida - Lucinidae
Lucina sp.
Lucina sp. Bruguière 1797 clam
 Ostreida - Bakevelliidae
Pseudoptera sp.
Pseudoptera sp. Meek 1873 oyster
 Ostreida - Gryphaeidae
Exogyra levis, Exogyra acroumbonata, Pycnodonte newberryi
 Pectinida - Plicatulidae
Plicatula sp.
Plicatula sp. Lamarck 1801 scallop