Yale Point, AZ (A5-7) (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: marine; lithified, black, green, calcareous shale

• Olive black to dark olive gray, moderately indurated, poorly to moderately laminar.

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 3081: 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
unclassified
  -
Neogastropod indet.
Gastropoda
 Sorbeoconcha - Naticidae
Euspira concinna
Euspira concinna moon snail
 Sorbeoconcha - Aporrhaidae
Drepanocheilus ruidium
Drepanocheilus ruidium snail
originally entered as "Drepanochilus ruidium"
Cephalopoda
 Ammonitida - Acanthoceratidae
Metoicoceras sp.
Metoicoceras sp. Hyatt 1903 ammonite
originally entered as "Metiococeras sp."
 Ammonitida - Baculitidae
Sciponoceras sp.
Sciponoceras sp. Hyatt 1894 ammonite
Bivalvia
  -
Bivalvia indet.
Bivalvia indet. Linnaeus 1758 clam
originally entered as "Infaunal bivalve"
 Solemyida - Solemyidae
Solemya obscura
Solemya obscura Awning Clam
 Lucinida - Lucinidae
Lucina sp.
Lucina sp. Bruguière 1797 clam
 Poromyida - Poromyidae
Liopistha sp.
Liopistha sp. Meek 1864 clam
 Pholadida - Corbulidae
Corbula sp.
Corbula sp. Bruguière 1789 clam
 Myalinida - Inoceramidae
Inoceramidae indet.
Inoceramidae indet. Giebel 1852 clam
originally entered as "informal Inoceramid indet."; changed by JA 21.2.07
 Ostreida - Gryphaeidae
Pycnodonte newberryi
 Pectinida - Plicatulidae
Plicatula sp.
Plicatula sp. Lamarck 1801 scallop