Nearshore zone +1, Dalton Quadrangle, Hamilton Mountain: Caradoc, Georgia
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Strophomenata
- Strophomenida
- Sowerbyellidae
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Sowerbyella sp.
Jones 1928
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Rhynchonellata
- Atrypida
- Anazygidae
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Zygospira recurvirostris
(Hall 1847)
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| recombined as Anazyga recurvirostra | ||||||||||
| Hall | ||||||||||
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Rhynchonellata
- Rhynchonellida
- Rhynchotrematidae
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Rhynchotrema minnesotensis
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| Sandeson | ||||||||||
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Rhynchotrema increbescens
(Hall 1847)
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| Hall | ||||||||||
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Rhynchonellata
- Rhynchonellida
- Orthorhynchulidae
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Orthorhynchula linneyi
(James 1881)
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| James | ||||||||||
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Rhynchonellata
- Rhynchonellida
- Camarotoechiidae
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Camarotoechia sp.
Hall and Clarke 1893
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Rhynchonellata
- Rhynchonellida
- Ancistrorhynchidae
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Ancistrorhyncha costata
Ulrich and Cooper 1942
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| Ulrich & Cooper | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Georgia | County: | Whitfield |
| Coordinates: | 34.8° North, 85.0° West (view map) | ||||
| Paleocoordinates: | 29.4° South, 65.9° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Ordovician | Epoch: | Late/Upper Ordovician |
| 10 m.y. bin: | Ordovician 4-5 | ||
| *Period: | Middle Ordovician - Late/Upper Ordovician | ||
| Key time interval: | Caradoc | ||
| Age range of interval: | 458.40000 - 449.60000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Lourdes | ||||
| Stratigraphy comments: No information given |
Lithology and environment
| Primary lithology: | red,yellow siltstone |
| Secondary lithology: | yellow sandstone |
| Includes fossils? | Y |
| Lithology description: \"The upper one-fourth of the zone is composed of red to yellow siltstone with an occasional mottled bed showing purplish splotches. A fine-grained, buff-colored sandstone occurs about 45 feet below the top of the zone. The middle part of the zone at Hamilton Mountain is composed of red siltstone with a bed of conglomeratic sandstone 2 feet thick at its base. The lower half of the zone is composed of red and yellow alternating beds of thinly laminated siltstone. About 5 feet above the base occurs a fossil horizon containing both identifiable and unidentifiable fragments of brachiopods and bryozoa. The lowest member of the zone is a bed of medium-grained yellowish sandstone about 2 to 4 feet thick. In some sections small pebbles randomly scattered through it give it a loose conglomeratic texture." | |
| Environment: | shallow subtidal indet. |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | difficult macrofossils |
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 32456 | ||
| Authorizer: | S. Holland | Enterer: | T. Hanson |
| Modifier: | S. Holland | Research group: | marine invertebrate |
| Created: | 2003-07-01 13:57:45 | Last modified: | 2004-10-20 09:26:56 |
| Access level: | the public | Released: | 2003-07-01 13:57:45 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 8741. | A. T. Allen and J. G. Lester. 1957. Zonation of the Middle and Upper Ordovician strata in northwestern Georgia. Georgia State Division of Conservation, the Geological Survey Bulletin 66:1-104 [S. Holland/T. Hanson/T. Hanson] |