Sample #92LM10 - White Tail Ridge Formation (Oregon) (Eocene of the United States)

Also known as Record #10

Where: Douglas County, Oregon (43.2° N, 123.2° W: paleocoordinates 47.2° N, 104.2° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Berrry Creek Member (White Tail Ridge Formation), Ypresian (56.0 - 47.8 Ma)

• 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 late Early Eocene to early Middle Eocene age, but the member is more precisely dated as Ulatisian (C23n/r/CP11)=Ypresian.

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; poorly lithified, bioturbated, fine-grained, medium, pebbly, shelly/skeletal sandstone

• < 50 m paleodepth.
• 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.

Size class: macrofossils

Collection methods: quarrying,

• Collected by L. Marincovich (1992). Collections presumably reposited at USGS Menlo Park or USNM.

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 52272: authorized by Austin Hendy, entered by Austin Hendy on 02.08.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Presumably identified by L. Marincovich
Bivalvia
 Mytilida - Mytilidae
Brachidontes cowlitzensis Weaver and Palmer 1922 mussel
 Cardiida - Cardiidae
Clinocardium sp. Keen 1936 cockle
 Nuculida - Nuculidae
Acila decisa Conrad 1855 divaricate nutclam
Gastropoda
 Neogastropoda - Fasciolariidae
? Fusinus sp. Rafinesque 1815 snail
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium stentor Anderson and Hanna 1925 tusk shell
Echinoidea
 Spatangoida - Schizasteridae
Schizaster diabloensis Kew 1920 heart urchin