Yale Point, AZ (A5-3) (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, calcareous shale

• Moderately poorly indurated.

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 3077: authorized by Charles Marshall, entered by Sofy Low on 23.07.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Polychaeta
 Sabellida - Serpulidae
Bivalvia
 Solemyida - Solemyidae
Solemya obscura Awning Clam
 Ostreida - Gryphaeidae
 Ostreida - Pteriidae
Phelopteria sp. Stephenson 1953 pearl oyster
 Pectinida - Anomiidae
Anomia sp. Linnaeus 1758 jingle
 Myalinida - Inoceramidae
Inoceramidae indet. Giebel 1852 clam
originally entered as "informal Inoceramid indet."; changed by JA 21.2.07
"Inoceramus pictus" = Inoceramus (Inoceramus) pictus Sowerby 1829 clam
"pictus gracilestiatus" - originally entered as "Inoceramus pictus gracilestiatus"
Gastropoda
 Sorbeoconcha - Aporrhaidae
Drepanocheilus ruidium snail
originally entered as "Drepanochilus ruidium"
Perissoptera sp. Tate 1865 snail
 Neogastropoda -
Neogastropoda indet. Thiele 1929 snail
 Sorbeoconcha - Cerithiopsidae
Cerithiopsis sp. Hanley 1849 snail
 Vanikoroidea - Eulimidae
? Eulima sp. Risso 1826 snail
originally entered as "Eulima(?) sp."
 Cerithioidea - Turritellidae
Turritella sp. Lamarck 1799 turret shell
Cephalopoda
 Ammonoidea -
Ammonoidea "indet. 2" ammonite
originally entered as "Ammonite"; changed by JA 30.6.04
Ammonoidea "indet. 1" ammonite
"small smooth": originally entered as "Ammonite"; changed by JA 30.6.04
 Ammonitida - Acanthoceratidae
Pseudocalycoceras sp. Thomel 1969 ammonite
Euomphaloceras sp. Spath 1923 ammonite
 Ammonitida - Baculitidae
Sciponoceras sp. Hyatt 1894 ammonite