Sample #94T-1 - Myrtle Group (Oregon) (Jurassic of the United States)

Also known as Record 77

Where: Douglas County, Oregon (43.1° N, 123.5° W: paleocoordinates 39.8° N, 69.7° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Myrtle Group, Tithonian (152.1 - 145.0 Ma)

• Presumably from Myrtle Group. Lithostratigraphy is unclear, however. The Myrtle Group consists of Late Jurassic and Early to Middle Cretaceos turbidite and mass flow deposits considered to be either arc basin and or post-orogenic flysch basins syntectonic with waning phases of arc collapse. Macrofossil biostratigraphy suggests an Tithonian age.

• bed-level stratigraphic resolution

Environment/lithology: basinal (); lithified wackestone

• No environmental interpetation, though given basinal lithofacies are described, a basinal (siliciclastic) environment is chosen by enterer. "Turbidite and mass flow deposits considered to be either arc basin and or post-orogenic flysch basins syntectonic with waning phases of arc collapse"
• Presumably from low-graded metamorphosed graywackes.

Size class: macrofossils

Collection methods: quarrying,

• Unknown collector. 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 52314: authorized by Austin Hendy, entered by Austin Hendy on 03.08.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Unknown identifier.
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Bivalvia
 Pectinida - Buchiidae
Buchia cf. uncitoides
Buchia cf. uncitoides Pavlow 1907 scallop