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: basinal (); lithified, gray limestone
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.
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 3083: authorized by Charles Marshall, entered by Sofy Low on 23.07.1999
Creative Commons license: CC BY (attribution)
Taxonomic list
| Gastropoda | |
|
Cerithiopsis sp. Hanley 1849 snail | |
|
Euspira concinna moon snail
Eunaticina textilis moon snail | |
| Cephalopoda | |
|
| |
|
Euomphaloceras sp. Spath 1923 ammonite | |
|
Sciponoceras sp. Hyatt 1894 ammonite | |
|
Allocrioceras sp. Spath 1926 ammonite | |
| Bivalvia | |
|
Lucina sp. Bruguière 1797 clam | |
|
Corbula sp. Bruguière 1789 clam | |
|
Inoceramidae indet. Giebel 1852 clam originally entered as "informal Inoceramid indet."; changed by JA 21.2.07
| |
|
Exogyra acroumbonata oyster
Pycnodonte newberryi oyster | |
|
| |
| Sedentaria | |