Sample #92LM3 - Tenmile Formation (Oregon): Ypresian, Oregon

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Opisthobranchia - Retusidae
Cylichnina tantilla (Anderson and Hanna 1925)
Gastropoda - Turritellidae
Turritella uvasana Conrad 1855
Subspecies: Turritella uvasana hendoni
Bivalvia - Nuculanida - Yoldiidae
? Yoldia sp. Möller 1842
Bivalvia - Nuculida - Nuculidae
Acila decisa (Conrad 1855)
Bivalvia - Mytilida - Mytilidae
Brachidontes cowlitzensis (Weaver and Palmer 1922)
Bivalvia - Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758
Bivalvia - Cardiida - Cardiidae
Acanthocardia brewerii (Gabb 1864)
recombined as Schedocardia brewerii
? Clinocardium sp. Keen 1936
Bivalvia - Cardiida - Veneridae
Pitar sp. Römer 1857
Microcallista conradiana (Gabb 1864)
recombined as Microcallista (Costacallista) conradiana
see common names

Geography
Country:United States State/province:Oregon County:Douglas
Coordinates: 43.3° North, 123.1° West (view map)
Paleocoordinates:47.3° North, 104.1° 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:Tenmile
Local section:Freer Bridge Local bed:lower
Regional section:Tyee
Stratigraphic resolution:bed
Stratigraphy comments: From lower Tenmile Formation, Umpqua Group. This is equivalent to strata formely referred to as Tenmile Member and Umpqua Formation and time equivalent to Lookingglass Formation. The Tenmile Formation conformably overlies the Bushnell Rock Formation and Slater Creek Member and underlies the Whitetail Ridge Formation. Macrofossil biostratigraphy suggests an Eocene, maybe Early Eocene age, but the member is more precisely dated as latest Penutian (C24n/CP10-11)=Ypresian.
Lithology and environment
Primary lithology: poorly lithified sandstone
Includes fossils?Y
Lithology description: Unsure of exact lithofacies. "The Tenmile Formation consists of classic turbidite basin deposits.....They consist of deep-marine, inner, middle, and outer submarine fan turbidite sandstone sequences and basinal mudstones deposited in a marginal basin setting". Presumably, given the paleoecology, the macrofossils were derived from redeposited shallow-water sandstone sediments. Presumed to be at least poorly lithified given facies, local tectonics and thickness of overlying strata - but not stated in text.
Environment:offshore
Geology comments: Deep-marine, inner, middle, and outer submarine fan turbidite. 20-185 m.
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 by L. Marincovich (1992). Collections presumably reposited at USGS Menlo Park or USNM.
Taxonomic list comments:Presumably identified by L. Marincovich
Metadata
Also known as:Record #3
Database number:52267
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2005-08-02 16:07:05 Last modified:2013-11-25 13:37:23
Access level:the public Released:2005-08-02 16:07:04
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]