Also known as USGS M6525; 75APr45A (Plafker field #)
Where: Lituya County, Alaska (58.4° N, 137.1° W: paleocoordinates 58.2° N, 133.0° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Topsy Formation, Burdigalian to Burdigalian (20.4 - 11.6 Ma)
• Topsy Formation consists of about 365 metres of hard calcareous siltstone and sandstone that intertongue with and in part, conformably overlie the Cenotaph Volcanics. Topsy Formation underlies Yakataga Formation (early Miocene-Holocene). Age originally assigned to post-early Oligocene to pre-middle Miocene based on volcanics (Plafker, 1967). Biostratigraphy in this reference constrains age to early or middle Miocene
• bed-level stratigraphic resolution
Environment/lithology: coastal; lithified siltstone and lithified sandstone
Size class: macrofossils
Reposited in the USNM
Collection methods: quarrying,
• Fossil collections are housed in the USGS, Menlo Park, and type specimens in the NMNH, Washington
Primary reference: L. Marincovich. 1979. Miocene molluscks of the Topsy Formation, Lituya district, Gulf of Alaska Tertiary Province, Alaska. United States Geological Survey Professional Paper 1125(C):C1-C14 [A. Miller/A. Hendy/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 37385: authorized by Austin Hendy, entered by Austin Hendy on 14.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Natica (Cryptonatica) oregonensis Conrad 1865 moon snail | |
Neptunea (Sulcosipho) cf. tabulata Baird 1863 true whelk
? Neptunea (Neptunea) plafkeri true whelk
? Colus sp. Röding 1798 true whelk | |
Bivalvia | |
Acila (Truncacila) taliaferroi divaricate nutclam
Acila (Truncacila) sp. Grant and Gale 1931 divaricate nutclam | |
Macoma albaria Conrad 1849 tellin clam | |
"Thyasira cf. disjuncta" = Conchocele bisecta
"Thyasira cf. disjuncta" = Conchocele bisecta Conrad 1849 clam |