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
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 | |
Bivalvia | |
Solemya obscura Awning Clam | |
Phelopteria sp. Stephenson 1953 pearl oyster | |
Anomia sp. Linnaeus 1758 jingle | |
Inoceramidae indet., "Inoceramus pictus" = Inoceramus (Inoceramus) pictus
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 | |
Perissoptera sp. Tate 1865 snail | |
Neogastropoda indet. Thiele 1929 snail | |
Cerithiopsis sp. Hanley 1849 snail | |
| |
Turritella sp. Lamarck 1799 turret shell | |
Cephalopoda | |
Ammonoidea "indet. 1" ammonite "small smooth": originally entered as "Ammonite"; changed by JA 30.6.04
| |
Pseudocalycoceras sp. Thomel 1969 ammonite
Euomphaloceras sp. Spath 1923 ammonite | |
Sciponoceras sp. Hyatt 1894 ammonite |