West Slope of Derry Hills, Fra Cristobal Formation, Collection 16: Carboniferous, New Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Rhynchonellata
- Athyridida
- Athyrididae
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Composita subtilita
(Hall 1852)
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Rhynchonellata
- Spiriferida
- Spiriferidae
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Spirifer occidentalis
Girty 1927
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| replaced by Anthracospirifer occiduus | |||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | New Mexico | County: | Sierra |
| Coordinates: | 32.8° North, 107.3° West (view map) | ||||
| Paleocoordinates: | 7.5° South, 46.1° West | ||||
| Geographic resolution: | small collection |
Time
| Period: | Carboniferous | ||
| 10 m.y. bin: | Carboniferous 1-5 | ||
| *Period: | Middle Carboniferous - Late/Upper Carboniferous | *Epoch: | Derry Series |
| Key time interval: | Carboniferous | ||
| Age range of interval: | 358.90000 - 298.90000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Mud Springs | Formation: | Fra Cristobal | ||
| Local section: | Derry Hills | Local bed: | Unit 16 | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Derry series is divided into 2 groups and 4 formations. At the type locality, the Derryan consists of alternating limestone (80 %) and shales (20%), approximately 127 feet thick, lying unconformably upon Devonian shale. Unit 16 = 13 ft. | |||||
Lithology and environment
| Primary lithology: | shelly/skeletal,gray lithified cherty/siliceous "limestone" |
| Lithology description: Unit 16: Limestone; lower 8 feet light gray, coarse grained, crinoidal; upper 5 feet dark gray, coarse grained; lower 10 feet breaks down to a slope; nodules and stringers of chert throughout; silicified corals in top bed | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,replaced with silica |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | difficult macrofossils |
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Taxonomic list comments:Except for noting the presence of crinoids and silicified corals, only brachiopods reported. | |
Metadata
| Database number: | 9859 | ||
| Authorizer: | T. Olszewski | Enterer: | K. Nell | Research group: | marine invertebrate |
| Created: | 2001-02-20 12:02:00 | Last modified: | 2003-07-18 18:05:03 |
| Access level: | the public | Released: | 2001-02-20 12:02:00 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 844. | J. L. Gehrig. 1958. Middle Pennsylvanian Brachiopods From the Mud Springs Mountains and Derry Hills, New Mexico. State Bureau of Mines and Mineral Resources, Memoir 3 1-24 [T. Olszewski/K. Nell] |