Dillingham - #2 (McRoberts & Blodgett, 2000) (Triassic of the United States)

Also known as Locality #2

Where: Dillingham County, Alaska (60.9° N, 157.4° W: paleocoordinates 7.8° N, 80.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Holitna Group, Norian (228.0 - 208.5 Ma)

• No formal stratigraphic name has been applied to the Triassic rocks of the Taylor Mountain D-2 and D-3 quadrangles. The term "Holitna Group" has been suggested to be too broadly defined (includes all Paleozoic carvonates in the Holitna River section). LePain and others (2000) designated these strata as Tzrlc (silty limestone and chert) on their geological map. Total thickness of Triassic rocks in section is unknown, although a minimum thickness of 300 m is estimated.

• bed-level stratigraphic resolution

Environment/lithology: marine; yellow, silty mudstone

• From Farewell terrane of southwestern and west-central Alaska. Farewell terrane is of early and middle Paleozoic age and probably originated as a rifted continental margin sequence derived from the Siberian continent by a Devopnian or slightly later rifting event. Deepening upward succession
• Light-yellow-gray-weathering, platy, silty-mudstone

Size class: macrofossils

Preservation: recrystallized, replaced with silica

Collection methods: quarrying,

• Collected by R.B. Blodgett (1984, 1999). Field #99RB37.Consists almost entirely of brachiopods and much rarer bivalves. Collections deposited in U of Alaska Museum in Fairbanks

Primary reference: C. A. McRoberts and R. B. Blodgett. 2000. Late Triassic (Norian) mollusks from the Taylor Mountains quadrangle, southwestern Alaska. United States Geological Survey Professional Paper 1662:55-67 [A. Miller/A. Hendy/S. Kolbe]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 39898: authorized by Austin Hendy, entered by Austin Hendy on 11.06.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Comprehensive for mollusca
 Trigoniida - Trigoniidae
Maoritrigonia sp. Fleming 1962 clam