USGS Mesozoic loc. 19962, 19948: Bajocian, Alaska
collected by H. Wedow and L.B. Kellum 1944
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Trigoniida
- Myophorellidae
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Myophorella argo
Crickmay 1930
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| Hypotypes USNM 219878, 219880-219882 | ||||||||||
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Vaugonia imlayi n. sp.
Poulton 1979
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| Holotype USNM 219907, Paratype 219908-219910 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Alaska |
| Coordinates: | 59.8° North, 153.2° West (view map) | ||
| Paleocoordinates: | 28.8° North, 84.9° West | ||
| Basis of coordinate: | estimated from map |
Time
| Period: | Jurassic | Epoch: | Middle Jurassic |
| Stage: | Bajocian | 10 m.y. bin: | Jurassic 4 |
| Key time interval: | Bajocian | Ammonoid zone: | Otoites sauzei |
| Age range of interval: | 170.90000 - 168.20000 m.y. ago |
Stratigraphy
Lithology and environment
| Primary lithology: | massive,medium,coarse lithified sandstone |
| Secondary lithology: | lenticular lithified conglomerate |
| Includes fossils? | Y |
| Lithology description: "Sandstone medium bedded to massive medium to coarse grained olive gray to dusky yellow green weathers dark brown lenticular beds of pebble cobble conglomerate silty shale and siltstone in lower part of unit one thin bed of chocolate brown friable sandstone near base of unit many coquina beds Witchellia Trigonia and Inoceramus." (Detterman and Hartsock, 1966) "The Gaikema Sandstone Member, named by Kirschner and Minard (1948) after Gaikema Creek on Iniskin Peninsula, is herein designated the Gaikema Sandstone. The type locality is designated as the left bank of the creek, starting 5,000 feet frO'm the mouth and continuing for 1,800 feet upstream. The section at the type locality is 850 feet thick and consists of resistant cliff forming sandstone, in part conglomeratic. Siltstone, shale, and cobble-boulder conglomerate are subordinate constituents." (Detterman, 1963) | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Collection methods: | field collection,survey of museum collection | ||
| Reason for describing collection: | biostratigraphic analysis | ||
| Museum repositories: | USNM | ||
| Collectors: | H. Wedow and L.B. Kellum | Collection dates: | 1944 |
Metadata
| Database number: | 125759 | ||
| Authorizer: | G. Stanley | Enterer: | H. Shepherd |
| Modifier: | H. Shepherd | ||
| Created: | 2012-03-22 05:57:27 | Last modified: | 2013-02-12 18:58:12 |
| Access level: | the public | Released: | 2012-03-22 05:57:27 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 40842. | T. P. Poulton. 1979. Jurassic Trigoniid Bivalves from Canada and Western United States of America. Geological Survey of Canada Bulletin 282 [G. Stanley/H. Shepherd/H. Shepherd] |