USGS 8834, Threemile Cove, Gravina Island (Triassic of the United States)

Also known as G.C.M.-6

Where: Alaska (55.2° N, 131.8° W: paleocoordinates 0.1° S, 70.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Nehenta Formation, Lacian (221.5 - 215.6 Ma)

• Probably about 100 feet below locality 8704.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified, massive limestone

Size class: macrofossils

Collected by Martin and Overbeck in 1914; reposited in the USNM

Primary reference: J. P. Smith. 1927. Upper Triassic marine invertebrate faunas of North America. United States Geological Survey Professional Paper 141:1-262 [D. Bottjer/C. Powers/M. Clapham]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 112236: authorized by Arnold Miller, entered by Sarah Kolbe on 07.07.2011, edited by Catherine Powers

Creative Commons license: CC BY (attribution)

Taxonomic list

• Identified by T.W. Stanton.
Anthozoa
  -
Anthozoa indet. Ehrenberg 1834
 Scleractinia - Stylophyllidae
"Stylophyllopsis zitteli" = Phacelostylophyllum zitteli
"Stylophyllopsis zitteli" = Phacelostylophyllum zitteli Frech 1890 stony coral
 Scleractinia - Pamiroseriidae
"Confusastrea cowichanensis" = Ampakabastraea cowichanensis
"Confusastrea cowichanensis" = Ampakabastraea cowichanensis Clapp and Shimer 1911 stony coral
Included in synonymy of K. decussata and K. cowichanensis by Stanley & Whalen, 1989
Hydrozoa
 Spongiomorphida - Spongiomorphidae
Bivalvia
 Ostreida - Cassianellidae
Cassianella sp. Beyrich 1862 oyster
 Trigoniida - Myophoriidae
? Myophoria sp. Bronn 1834 clam
Gastropoda
 Zygopleuroidea - Protorculidae
Protorcula bassetti n. sp. Smith 1927 snail
Probably ?Murchisonia sp. in Buddington and Chapin
 Sorbeoconcha - Naticidae
"Natica" sp. Scopoli 1777 moon snail