Alexander Terrane, Nelson Cove, Gravina Island (Triassic of the United States)

Also known as Reef 50

Where: Alaska (55.3° N, 131.8° W: paleocoordinates 0.1° N, 70.9° W)

• coordinate estimated from map

• small collection-level geographic resolution

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

• Alexander Terrane, Early Norian

Environment/lithology: reef, buildup or bioherm; lithified reef rocks

• Within the Alexander Terrane...Only one Triassic locality appears to fit the criteria to be considered a reef. This locality crops out along the shores of Gravina Island (MI 9935)...This is a patch reef that averages 8-10 m in thickness with a lateral extension of 50-58 m (Senowbari-Daryan and Caruthers and Stanley 2008)

Size class: macrofossils

Preservation: replaced with silica

Collection methods: chemical, acetic,

Primary reference: A. H. Caruthers and G. D. Stanley , Jr. 2008. Systematic analysis of upper triassic silicified scleractinian corals from Wrangellia and the Alexander Terrane, Alaska and British Columbia. Journal of Paleontology 82(3):470-491 [W. Kiessling/A. Girndt]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 82661: authorized by Wolfgang Kiessling, entered by Antje Girndt on 31.07.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Anthozoa
 Scleractinia - Astraeomorphidae
Astraeomorpha confusa, Astraeomorpha crassisepta
Astraeomorpha confusa Winckler 1861 stony coral
Astraeomorpha crassisepta Reuss 1854 stony coral
 Scleractinia - Reimaniphylliidae
Paracuifia anomala
Paracuifia anomala Caruthers and Stanley 2008 stony coral
UMIP 400360
 Scleractinia - Stylophyllidae
Meandrostylis vancouverensis
Meandrostylis vancouverensis Clapp and Shimer 1911 stony coral