Sample #24DV92 - White Tail Ridge Formation (Oregon): Ypresian, Oregon
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia
- Mytilida
- Mytilidae
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Brachidontes cowlitzensis
(Weaver and Palmer 1922)
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Bivalvia
- Cardiida
- Cardiidae
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Acanthocardia brewerii
(Gabb 1864)
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recombined as Schedocardia brewerii | |||||||
see common names |
Geography
Country: | United States | State/province: | Oregon | County: | Douglas |
Coordinates: | 43.2° North, 123.2° West (view map) | ||||
Paleocoordinates: | 47.2° North, 104.2° West | ||||
Basis of coordinate: | stated in text | ||||
Geographic resolution: | outcrop |
Time
Period: | Paleogene | Epoch: | Eocene |
Stage: | Ypresian | 10 m.y. bin: | Cenozoic 2 |
Key time interval: | Ypresian | ||
Age range of interval: | 56.00000 - 47.80000 m.y. ago |
Stratigraphy
Geological group: | Umpqua | Formation: | White Tail Ridge | Member: | Berrry Creek |
Local section: | County Road 36 | ||||
Regional section: | Tyee | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: Presumably from the Berry Creek Member of the White Tail Ridge Formation, Umpqua Group. This is equivalent to strata formely referred to as White Tail Member, Okalla Creek Member, and Umpqua Formation and time equivalent to Lookingglass and Flournoy Formation. The White Tail Ridge Formation unconformably overlies the Tenmile Formation and underlies the Camas Valley Member. Macrofossil biostratigraphy suggests an Early Eocene to late Middle Eocene age, but the member is more precisely dated as Ulatisian (C23n/r/CP11)=Ypresian. |
Lithology and environment
Primary lithology: | hummocky CS,bioturbation,fine,medium,pebbly,shelly/skeletal poorly lithified sandstone |
Includes fossils? | Y |
Lithology description: Mollusk bearing, bioturbated and hummocky bedded fine- to medium-grained pebbly lithic arkosic sandstone. Presumed to be at least poorly lithified given facies, local tectonics and thickness of overlying strata - but not stated in text. | |
Environment: | shoreface |
Glacial or sequence phase: | regressive |
Geology comments: wave-dominated shoreline or deltaic environment; very shallow water, near shelf paleodepth. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | selective quarrying,field collection |
Reason for describing collection: | biostratigraphic analysis |
Collection method comments: Collected in 1992. Collections presumably reposited at USGS Menlo Park or USNM. | |
Taxonomic list comments:Presumably identified by L. Marincovich |
Metadata
Also known as: | Record #11 | ||
Database number: | 52273 | ||
Authorizer: | A. Hendy | Enterer: | A. Hendy |
Modifier: | A. Hendy | Research group: | marine invertebrate |
Created: | 2005-08-02 16:48:41 | Last modified: | 2013-11-25 13:37:23 |
Access level: | the public | Released: | 2005-08-02 16:48:40 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
14064. | R. E. Wells, A. S. Jayko, A.R. Niem, G. Black, T. Wiley, E. Baldwin, K. Molenaar, K.L. Wheeler, C.B. DuRoss and R.W. Givler. 2000. Geologic Map and Database of the Roseburg 30 x 60' Quadrangle, Douglas and Coos Counties, Oregon. United States Geological Survey Open-File Report 00-367 [A. Miller/A. Hendy/A. Hendy] |