Locality 8, Clarkston Mountains, Zone "H", upper: Blackhillsian, Utah
collected by R. J. Ross, Jr. 1946-1947
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Pterobranchia
- Graptoloidea
- Pterograptidae
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Didymograptus cf. nitidus
(Hall 1858)
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| recombined as Didymograptellus nitidus | ||||||||||
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Pterobranchia
- Graptoloidea
- Anisograptidae
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Dictyonema cf. flabelliforme
(Eichwald 1840)
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| recombined as Rhabdinopora flabelliformis | ||||||||||
| D. cf. flabelliforme anglicum also listed | ||||||||||
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Rhabdinopora anglica
(Bulman 1927)
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Wagner 2020 | |||||||||
| recombined as Rhabdinopora flabelliformis anglica | ||||||||||
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Trilobita
- Asaphida
- Asaphidae
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Trigonocerca typica
Ross 1951
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Utah | County: | Box Elder |
| Coordinates: | 41.9° North, 112.1° West (view map) | ||||
| Paleocoordinates: | 7.6° South, 79.7° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician | Epoch: | Early/Lower Ordovician |
| Stage: | Floian | 10 m.y. bin: | Ordovician 2 |
| Key time interval: | Blackhillsian | Trilobite zone: | Trigonocerca typica |
| Age range of interval: | 473.90000 - 470.00000 m.y. ago |
Stratigraphy
| Formation: | Garden City | Member: | "Upper Cherty" | ||
| Stratigraphy comments: 135 foot interval beginning at 1343 feet above base of formation. Zone H. |
Lithology and environment
| Primary lithology: | lithified "limestone" |
| Secondary lithology: | black lithified chert |
| Lithology description: "Resistant thinly laminated, finely crystalline limestone with black chert content diminishing downward. Irregular laminae separated by paper-thin mud partings." | |
| Environment: | shallow subtidal indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection | ||
| Reason for describing collection: | biostratigraphic analysis | ||
| Museum repositories: | YPM | ||
| Collectors: | R. J. Ross, Jr. | Collection dates: | 1946-1947 |
Metadata
| Database number: | 103888 | ||
| Authorizer: | M. Hopkins, P. Wagner | Enterer: | M. Hopkins, P. Wagner |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2011-02-03 03:54:58 | Last modified: | 2012-08-25 21:10:40 |
| Access level: | the public | Released: | 2011-02-03 03:54:58 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 25414. | R. J., J.r. Ross. 1951. Stratigraphy of the Garden City Formation in northeastern Utah, and its trilobite faunas. Yale Peabody Museum of Natural History Bulletin 6:1-161 [S. Finnegan/S. Finnegan/P. Wagner] |
Secondary references:
| 67159 | B.-D. Erdtmann. 1982. A reorganization and proposed phylogenetic classification of planktic Tremadoc (early Ordovician) dendroid graptolites. Norsk Geologisk Tidsskrift 62:121-145 [P. Wagner/P. Wagner] | |
| 65064 | P. Wagner. 2020. Subspecies kluges: a pointless taxonomic database to create species opinions for subspecies that then will be over-ruled and allow subspecies occurrences to be recognized as the subspecies rather than the parent species. [P. Wagner/P. Wagner/P. Wagner] |