Yale Point, AZ (A5-13) (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, gray, green, calcareous shale

• Claystone, dark olive gray, moderately indurated, moderately abundant gypsum, 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 3087: 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
Bivalvia
 Pectinida - Pectinoidae
Camptonectes sp.
Camptonectes sp. Meek 1864 scallop
 Ostreida - Pteriidae
Phelopteria sp.
Phelopteria sp. Stephenson 1953 pearl oyster
 Ostreida - Ostreidae
Ostreidae indet., Ostreidae indet.
Ostreidae indet. Rafinesque 1815 oyster
originally entered as "Oyster spat "
Ostreidae indet. Rafinesque 1815 oyster
originally entered as "Oyster indet."
 Ostreida - Gryphaeidae
Exogyra acroumbonata
 Myalinida - Inoceramidae
Inoceramidae indet., Inoceramus ? tenuistriatus(), "Inoceramus pictus" = Inoceramus (Inoceramus) pictus, "Inoceramus pictus" = Inoceramus (Inoceramus) pictus
Inoceramidae indet. Giebel 1852 clam
originally entered as "informal Inoceramid indet."; changed by JA 21.2.07
Inoceramus ? tenuistriatus() Sowerby 1814 clam
originally entered as "Inoceramus tenuistriatus(?)"
"Inoceramus pictus" = Inoceramus (Inoceramus) pictus Sowerby 1829 clam
"pictus pictus" - originally entered as "Inoceramus pictus pictus"
"Inoceramus pictus" = Inoceramus (Inoceramus) pictus Sowerby 1829 clam
"pictus gracilestiatus" - originally entered as "Inoceramus pictus gracilestiatus"
 Lucinida - Lucinidae
Lucina sp.
Lucina sp. Bruguière 1797 clam
 Solemyida - Solemyidae
Solemya obscura
Solemya obscura Awning Clam
Cephalopoda
 Ammonoidea -
Ammonoidea indet.
Ammonoidea indet. ammonite
"small smooth": originally entered as "Ammonite"; changed by JA 30.6.04
 Ammonitida - Baculitidae
Sciponoceras sp.
Sciponoceras sp. Hyatt 1894 ammonite
Anthozoa
 Scleractinia - Caryophylliidae
"Platycyathus sp." = Trochocyathus (Platycyathus)
"Platycyathus sp." = Trochocyathus (Platycyathus) Fromentel 1863 stony coral