Where: Cocconino County, Arizona (35.7° N, 110.8° W: paleocoordinates 37.1° N, 74.1° W)
• small collection-level geographic resolution
When: Sciponoceras zone, Mancos Shale Formation, Late/Upper Cenomanian (99.6 - 93.5 Ma)
• 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, burrowed, silty, calcareous sandstone
Note: Section A1 constitutes interbedded limestones, sandstones, 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 2171: authorized by Charles Marshall, entered by Sofy Low on 23.06.1999
Creative Commons license: CC BY (attribution)
Taxonomic list
| Sedentaria | |
| Bivalvia | |
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| |
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Lucina sp. Bruguière 1797 clam | |
|
Cymbophora sp. Gabb 1869 clam | |
|
Corbula sp. Bruguière 1789 clam | |
|
Lithophaga sp. Röding 1798 mussel | |
|
Pseudoptera sp. Meek 1873 oyster | |
|
| |
|
Pycnodonte newberryi oyster
Gryphaeostrea sp. Conrad 1865 oyster
Exogyra levis oyster
Exogyra acroumbonata oyster | |
|
Lima sp. Bruguière 1797 file clam | |
|
Inoceramidae indet. Giebel 1852 clam originally entered as "informal Inoceramid indet."; changed by JA 21.2.07
| |
| Cephalopoda | |
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Sciponoceras sp. Hyatt 1894 ammonite | |
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Metoicoceras sp. Hyatt 1903 ammonite | |
| Gastropoda | |
|
| |
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Turritella sp. Lamarck 1799 turret shell | |
| Mesostoma | |
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Mesostoma sp. Ehrenberg 1837 | |