Amerada, Herman-May No.1 Fryburg Area 13,245' ft: Stairsian, North Dakota
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Eocrinoidea
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Eocrinoidea indet.
Jaekel 1918
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Gastropoda
- Euomphalina
- Ophiletidae
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Lecanospira informal sp. undet.
Butts 1926
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Gastropoda
- Euomphalina
- Raphistomatidae
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Raphistomina cf. sinclairensis
Kobayashi 1955
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| recombined as Ceratopea sinclairensis | |||||||
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Gastropoda
- Euomphalina
- Macluritidae
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"Lytospira" ornata n. sp.
Lochman 1966
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| recombined as Macluritella ornata | |||||||
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Gastropoda
- Sinuopeidae
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Euconia cf. conica
(Heller 1954)
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| recombined as Euconia conicus | |||||||
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Rhynchonellata
- Pentamerida
- Clarkellidae
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Syntrophina nana
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Rhynchonellata
- Orthida
- Plectorthidae
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Nanorthis putilla
(Walcott 1924)
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Trilobita
- Corynexochida
- Leiostegiidae
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Lloydia (Evansaspis) formosa
(Hintze 1953)
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| see common names | |||||||
Geography
| Country: | United States | State/province: | North Dakota | County: | Billings |
| Coordinates: | 48.0° North, 102.9° West (view map) | ||||
| Paleocoordinates: | 11.9° South, 74.5° West | ||||
| Basis of coordinate: | based on political unit | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician | Epoch: | Early/Lower Ordovician |
| Stage: | Tremadocian | 10 m.y. bin: | Ordovician 1 |
| Key time interval: | Stairsian | Trilobite zone: | Tesselacauda |
| Age range of interval: | 482.00000 - 480.30000 m.y. ago |
Stratigraphy
| Formation: | Deadwood | ||||
| Local section: | Herman-May No.1 | Local bed: | 13,245 ft | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "L. Ord. m. Arenig"; Zone E | |||||
Lithology and environment
| Primary lithology: | "limestone" | ||
| Lithology description: coarse- to medium-grained limestone matrix with large pieces of glauconite, glauconitized dense limestone pebbles, crinoid joints and gastropod steinkerns, intercalated with black silty shale; rare pyrite blebs. | |||
| Environment: | transition zone/lower shoreface | Tectonic setting: | passive margin |
| Geology comments: "sh., ls and ss. ? lower shoreface or nearshore shelf lagoon. cratonic shelf" | |||
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
| Taxonomic list comments:"Lochman-Balk and Wilson, 1967. Biostrat. lists" | |
Metadata
| Database number: | 119478 | ||
| Authorizer: | P. Wagner | Enterer: | P. Wagner |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2011-10-27 12:33:34 | Last modified: | 2011-10-26 20:34:05 |
| Access level: | the public | Released: | 2011-10-27 12:33:34 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 13452. | C. Lochman. 1966. Lower Ordovician (Arenig) faunas from the Williston Basin, Montana and North Dakota. Journal of Paleontology 40(3):512-548 [P. Wagner/P. Wagner/P. Wagner] |