USGS 9900, Threemile Cove, Gravina Island (Triassic of the United States)

Also known as 16 ACh 137

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: Lacian (221.5 - 215.6 Ma)

Environment/lithology: lithified limestone

Size class: macrofossils

Collected by T. Chapin in 1916

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 112251: authorized by Arnold Miller, entered by Sarah Kolbe on 07.07.2011, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• Identified by J.B. Reeside, Jr.
Show authors, comments, and common names
Gastropoda
 Cerithioidea - Cerithiidae
? Cerithium sp.2
? Cerithium sp.2 Bruguière 1789 cerith snail
 Sorbeoconcha - Naticidae
? Natica sp.2
? Natica sp.2 Scopoli 1777 moon snail
Hydrozoa
 Milleporina - Heterastrididae
Heterastridium sp.1
Heterastridium sp.1 Reuss 1865 fire coral
 Spongiomorphida - Spongiomorphidae
Spongiomorpha gibbosa
Spongiomorpha gibbosa Frech 1890
Presumably ?Spongiomorpha sp. in Buddington & Chapin
Anthozoa
 Scleractinia - Pamiroseriidae
"Thamnastraea cf. rectilamellosa" = Pamiroseris rectilamellosa2
"Thamnastraea cf. rectilamellosa" = Pamiroseris rectilamellosa2 Winckler 1861 stony coral
 Scleractinia - Astraeomorphidae
Astraeomorpha crassisepta3
Astraeomorpha crassisepta3 Reuss 1854 stony coral
 Scleractinia - Gablonzeriidae
"Isastrea profunda" = Gablonzeria profunda
"Isastrea profunda" = Gablonzeria profunda Reuss 1854 stony coral
Demospongiae
 Lithistida - Anthaspidellidae
Stromatomorpha californica
Stromatomorpha californica Smith 1927 demosponge
Presumably Hydrozoa indet. in Buddington & Chapin
1Berg and Cruz 1982; 2Buddington and Chapin 1929; 3Stanley, jr and Whalen 1989