Yale Point, AZ (A5-2): Cenomanian, Arizona
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonoidea
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Ammonoidea indet.
Zittel 1884
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1 specimen | |||||||||
| originally entered as "Ammonite"; changed by JA 30.6.04 | ||||||||||
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Cephalopoda
- Ammonitida
- Baculitidae
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Sciponoceras sp.
Hyatt 1894
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16 specimens | |||||||||
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Cephalopoda
- Ammonitida
- Acanthoceratidae
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Metoicoceras sp.
Hyatt 1903
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2 specimens | |||||||||
| originally entered as "Metiococeras sp." | ||||||||||
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Bivalvia
- Ostreida
- Gryphaeidae
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Exogyra levis
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1 specimen | |||||||||
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Pycnodonte newberryi
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35 specimens | |||||||||
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Gryphaeostrea sp.
Conrad 1865
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1 specimen | |||||||||
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Bivalvia
- Ostreida
- Ostreidae
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Ostreidae indet.
Rafinesque 1815
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2 specimens | |||||||||
| originally entered as "Oyster spat " | ||||||||||
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Bivalvia
- Lucinida
- Lucinidae
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Lucina sp.
Bruguière 1797
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44 specimens | |||||||||
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Bivalvia
- Carditida
- Astartidae
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? Astarte sp.
Sowerby 1816
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2 specimens | |||||||||
| originally entered as "Astarte(?) sp." | ||||||||||
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Gastropoda
- Naticidae
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Euspira concinna
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10 specimens | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Arizona | County: | Navajo |
| Coordinates: | 36.3° North, 109.8° West (view map) | ||||
| Paleocoordinates: | 37.5° North, 72.9° West | ||||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 | *Epoch: | Gallic |
| *International age/stage: | Cenomanian - Cenomanian | ||
| Key time interval: | Cenomanian | Zone: | Sciponoceras Ammonite |
| Age range of interval: | 100.50000 - 93.90000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Mancos Shale | ||||
| Local section: | A5 | Local bed: | 2 (Unit 4-6) | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: 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). | |||||
Lithology and environment
| Primary lithology: | gray lithified silty,calcareous "shale" | ||
| Environment: | carbonate indet. | Tectonic setting: | cratonic basin |
| Geology comments: Dark olive gray, moderately indurated, limestone nodule band approx. middle of sample. 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. | |||
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | bulk,mechanical,field collection |
| Reason for describing collection: | paleoecologic analysis |
| Collection method comments: Bulk sample disaggregated in lab. | |
Metadata
| Database number: | 3076 | ||
| Authorizer: | C. Marshall | Enterer: | S. Low |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 1999-07-23 18:44:27 | Last modified: | 2017-07-27 18:10:08 |
| Access level: | the public | Released: | 1999-07-23 18:44:27 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 93. | 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] |