Yale Point, AZ (A5-4) (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

• Poorly indurated, limestone nodule band 20 cm above base.

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 3078: 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.
Cephalopoda
 Ammonitida - Baculitidae
Sciponoceras sp.
Sciponoceras sp. Hyatt 1894 ammonite
Bivalvia
 Solemyida - Solemyidae
Solemya obscura
Solemya obscura Awning Clam
 Carditida - Astartidae
? Astarte sp.
? Astarte sp. Sowerby 1816 clam
originally entered as "Astarte(?) sp."
 Lucinida - Lucinidae
Lucina sp.
Lucina sp. Bruguière 1797 clam
 Ostreida - Ostreidae
Ostreidae indet.
Ostreidae indet. Rafinesque 1815 oyster
originally entered as "Oyster indet."
 Ostreida - Gryphaeidae
Pycnodonte newberryi, Exogyra acroumbonata
 Ostreida - Pteriidae
Phelopteria sp.
Phelopteria sp. Stephenson 1953 pearl oyster
Gastropoda
 Sorbeoconcha - Aporrhaidae
Drepanocheilus ruidium
Drepanocheilus ruidium snail
originally entered as "Drepanochilus ruidium"
 Sorbeoconcha - Cerithiopsidae
Cerithiopsis sp.
Cerithiopsis sp. Hanley 1849 snail
Mesostoma
  -
Mesostoma sp.
Mesostoma sp. Ehrenberg 1837