PBDB Collection

Gravina Island (Triassic of the United States)

Where: Alaska (55.2° N, 131.8° W)

• Paleocoordinates: 39.8° N, 71.7° W (Wright 2013)

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

• JA: originally entered as Norian; the kerri zone is basal Norian = Lacian

Environment/lithology: shallow subtidal; lithified limestone and lithified conglomerate

• Limestone interbedded with conglomerate. Limestones contain bioclastic grainstone and packstone facies.

Size class: macrofossils

Primary reference: G. D. Stanley, Jr. 1979. Paleoecology, structure, and distribution of Triassic coral buildups in western North America. The University of Kansas Paleontological Contributions 65:1-68 [A. Miller/S. Kolbe]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 100531: authorized by Arnold Miller, entered by Sarah Kolbe on 09.12.2010, edited by Matthew Clapham

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names

unclassified
-	Protocula bassetti Protocula bassetti
Hydrozoa
Spongiomorphida - Spongiomorphidae	Spongiomorpha gibbosa Spongiomorpha gibbosa Frech 1890
Anthozoa
Scleractinia - Montlivaltiidae	Elysastraea profunda, Margarastraea eucystis Elysastraea profunda Reuss 1854 stony coral Margarastraea eucystis stony coral
Scleractinia - Pamiroseriidae	"Elysastraea parva" = Ceriostella parva, Ceriostella martini "Elysastraea parva" = Ceriostella parva Smith 1927 stony coral Ceriostella martini Smith 1927 stony coral
Scleractinia - Reimaniphylliidae	""Thecosmilia" norica" = Retiophyllia norica, ""Thecosmilia" ("Thecosmilia") delicatula" = Retiophyllia delicatula, ""Thecosmilia" fenestrata" = Retiophyllia fenestrata, ""Montlivaltia" norica" = Distichophyllia norica, Palaeastraea borealis, Palaeastraea descussata ""Thecosmilia" norica" = Retiophyllia norica Frech 1890 stony coral ""Thecosmilia" ("Thecosmilia") delicatula" = Retiophyllia delicatula Frech 1890 stony coral ""Thecosmilia" fenestrata" = Retiophyllia fenestrata Reuss 1854 stony coral ""Montlivaltia" norica" = Distichophyllia norica Frech 1890 stony coral Palaeastraea borealis stony coral Palaeastraea descussata stony coral
Scleractinia - Comoseridae	"Spongiomorpha ramosa" = Eocomoseris ramosa "Spongiomorpha ramosa" = Eocomoseris ramosa Frech 1890 stony coral
Scleractinia - Thamnasteriidae	Thamnasteria (cf. Thamnastera) borealis Thamnasteria (cf. Thamnastera) borealis stony coral
unclassified
-	Porifera indet. Porifera indet. Grant 1836
Demospongiae
Lithistida - Anthaspidellidae	Stromatomorpha californica Stromatomorpha californica Smith 1927 demosponge
Gastropoda
Neritacea -	"Neritacea indet." = Neritoidea "Neritacea indet." = Neritoidea Rafinesque 1815 snail
Sorbeoconcha - Purpurinidae	Purpurina gravinaensis Purpurina gravinaensis Smith 1927 periwinkle
Murchisoniina - Zygopleuridae	Zygopleura sp. Zygopleura sp. snail
Bivalvia
Pectinida -	Pectinoidea indet. Pectinoidea indet. Rafinesque 1815 scallop
Pectinida - Limidae	Lima (cf. Lima) blackburnei Lima (cf. Lima) blackburnei Smith 1927 file clam
Trigoniida - Myophoriidae	Myophoria sp. Myophoria sp. Bronn 1834 clam
Cardiida -	Carditacea indet. Carditacea indet. Fleming 1820 clam
Rhynchonellata
Spiriferida -	Spiriferida indet. Spiriferida indet. Waagen 1883
Terebratulida -	Terebratulida indet. Terebratulida indet. Waagen 1883
Spiriferinida - Spondylospiridae	Zugmayerella (cf. Zugmayerella) ormana Zugmayerella (cf. Zugmayerella) ormana