"Trilobite zone", Ross Formation, sec. 1A: Gedinnine, Tennessee
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Trilobita
- Phacopida
- Phacopidae
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Phacops logani
Hall 1860
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| recombined as Paciphacops logani | ||||||||||
| "Common" | ||||||||||
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Strophomenata
- Strophomenida
- Leptaenoideidae
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Leptaenisca concava
(Hall 1857)
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Strophomenata
- Strophomenida
- Strophonellidae
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Strophonella lineolata
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Strophomenata
- Strophomenida
- Rafinesquinidae
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Leptaena rhomboidalis
(Wahlenberg 1818)
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| recombined as Leptaena (Leptaena) rhomboidalis | ||||||||||
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Strophomenata
- Strophomenida
- Leptostrophiidae
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Brachyprion purduei
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Rhynchonellata
- Atrypida
- Atrypinidae
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Atrypina imbricata
(Hall 1857)
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Rhynchonellata
- Spiriferida
- Delthyrididae
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Delthyris perlamellosa
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Rhynchonellata
- Rhynchonellida
- Eatoniidae
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Eatonia tennesseensis
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Rhynchonellata
- Rhynchonellida
- Uncinulidae
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Uncinulus swaynensis
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Uncinulus vellicatus
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Rhynchonellata
- Orthida
- Orthidae
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Orthostrophia strophomenoides
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Rhynchonellata
- Orthida
- Dalmanellidae
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Dalmanella pygmaea
Dunbar 1919
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| recombined as Isorthis pygmaea | ||||||||||
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Dalmanella eminens
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Dalmanella subcarinata
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Rhynchonellata
- Orthida
- Rhipidomellidae
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Rhipidomella oblata
(Hall 1857)
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| recombined as Rhipidomelloides oblata | ||||||||||
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Rhipidomella emarginata
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Rhynchonellata
- Orthida
- Dicoelosiidae
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Bilobites varicus
(Conrad 1842)
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| recombined as Dicoelosia varica | ||||||||||
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Rhynchonellata
- Athyridida
- Meristellidae
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Meristella atoka
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Rhynchonellata
- Athyridida
- Rhynchospirinidae
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Rhynchospira formosa
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| replaced by Rhynchospirina | ||||||||||
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Rhynchonellata
- Athyridida
- Anoplothecidae
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Anoplotheca concava
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Crinoidea
- Synbathocrinidae
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Phimocrinus sp. n. sp.
Schultze 1867
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Anthozoa
- Favositida
- Favositidae
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Favosites conicus
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Tennessee |
| Coordinates: | 36.0° North, 88.0° West (view map) | ||
| Paleocoordinates: | 36.6° South, 48.2° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Devonian | Epoch: | Early/Lower Devonian |
| Stage: | Lochkovian | 10 m.y. bin: | Devonian 1 |
| Key time interval: | Gedinnine | ||
| Age range of interval: | 419.20000 - 410.80000 m.y. ago |
Stratigraphy
| Formation: | Ross | Member: | Birdsong Shale | ||
| Local section: | 1A | Local bed: | Trilobite zone | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Sampled zone only 2.5 feet thick, but bluff 160 yards long (approx. 9-11.5 feet from top of formation, of which 22.5 feet are exposed). Listed as Gedinnian | |||||
Lithology and environment
| Primary lithology: | shelly/skeletal,blue poorly lithified argillaceous,calcareous "shale" |
| Secondary lithology: | lithified calcareous wackestone |
| Lithology description: Highly fossiliferous, soft, bluish, calcareous clay shale occasionally interbedded with limestone (packstones and wackestone) | |
| Environment: | offshore shelf |
| Geology comments: Background sedimentation with obrution deposits and tempestites in low energy, muddy environment | |
Taphonomy
| Modes of preservation: | body |
| Degree of concentration: | -single event |
| Size of fossils: | macrofossils,mesofossils |
| Spatial orientation: | life position |
| Articulated whole bodies: | many |
| Size sorting: | poor |
| Fragmentation: | none |
| Temporal resolution: | snapshot |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 75628 | ||
| Authorizer: | P. Novack-Gottshall | Enterer: | P. Hearn |
| Modifier: | P. Novack-Gottshall | Research group: | marine invertebrate |
| Created: | 2007-10-23 08:39:19 | Last modified: | 2008-06-23 12:08:02 |
| Access level: | the public | Released: | 2007-10-23 08:39:19 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 20740. | C.O. Dunbar. 1919. Stratigraphy and correlation of the Devonian of western Tennessee. Geological Survey Tennessee, Bulletin 21:1-127 [G. Webster/G. Webster] |