East of Bear Lake: Bathonian, Idaho
collected by D. G. Perry, B. D. E. Chatterton 1975
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Cephalopoda
- Belemnitida
|
||||||||||
|
Belemnitida indet.
Zittel 1895
|
||||||||||
| fragmental guards | ||||||||||
|
Bivalvia
- Ostreida
- Gryphaeidae
|
||||||||||
|
? Liostrea strigilecula
(White 1877)
|
||||||||||
|
Rhynchonellata
- Rhynchonellida
- Erymnariidae
|
||||||||||
|
Cryptorhynchia bearensis n. sp.
Perry 1979
|
||||||||||
|
Rhynchonellata
- Terebratulida
- Terebratulidae
|
||||||||||
|
Terebratulidae indet.
Gray 1840
|
||||||||||
| juveniles | ||||||||||
|
Crinoidea
- Isocrinida
- Pentacrinitidae
|
||||||||||
|
Pentacrinus sp.
Miller 1821
|
||||||||||
| nomen vanum belonging to Pentacrinites | ||||||||||
| mostly ossicles | ||||||||||
|
Hydrozoa
- Milleporina
|
||||||||||
|
? Milleporina indet.
|
||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Idaho | County: | Bear Lake |
| Coordinates: | 42.1° North, 111.2° West (view map) | ||||
| Paleocoordinates: | 34.8° North, 52.2° West | ||||
| Basis of coordinate: | stated in text | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Jurassic | Epoch: | Middle Jurassic |
| Stage: | Bathonian | 10 m.y. bin: | Jurassic 4 |
| Key time interval: | Bathonian | ||
| Age range of interval: | 168.20000 - 165.30000 m.y. ago |
Stratigraphy
| Formation: | Twin Creek Limestone | Member: | Boundary Ridge | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: "probably Bathonian age beds... lower part of the Twin Creek Limestone, some 175.3-182.9 m above the Lower Jurassic Nugget Formation in... the lower part of the Boundary Ridge Member" | |||||
Lithology and environment
| Primary lithology: | medium,shelly/skeletal,yellow lithified argillaceous grainstone |
| Lithology description: "buff-yellow weathering, slightly argillaceous, medium grained biosparites which locally have an intact framework of oyster, crinoid, and brachiopod shell debris. The fossiliferous units comprise 15-25-cm thick, resistant, lensoid beds (traced over 18 m laterally) which contain a very abundant silicified shelly fauna" | |
| Environment: | sand shoal |
| Geology comments: "shallow water, moderate energy marine environment" with "small oyster banks" that was "probably less than 30 m" in depth and is "interpreted to have formed on offshore bars" | |
Taphonomy
| Modes of preservation: | body,original silica,shellbed |
| Size of fossils: | macrofossils |
| Articulated whole bodies: | some |
| Disassociated minor elements: | many |
| Feeding/predation traces: | drill holes |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection methods: | bulk,selective quarrying,acetic,hydrochloric,field collection | ||
| Rock censused: | 27 kg | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | GSC | ||
| Collectors: | D. G. Perry, B. D. E. Chatterton | Collection dates: | 1975 |
| Collection method comments: "Four silicified blocks, representing approximately 27 kg of rock were dissolved in hyrochloric and acetic acids in order to recover the silicified faunas" | |||
Metadata
| Database number: | 90912 | ||
| Authorizer: | J. Alroy | Enterer: | J. Alroy |
| Modifier: | M. Carrano | Research group: | marine invertebrate |
| Created: | 2009-08-25 20:06:35 | Last modified: | 2022-12-20 14:33:50 |
| Access level: | the public | Released: | 2009-08-25 20:06:35 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 30589. | D. G. Perry. 1979. A Jurassic brachiopod-oyster association, Twin Creek Limestone, southeastern Idaho. Journal of Paleontology 53(4):997-1004 [J. Alroy/J. Alroy/J. Alroy] |