Also known as USGS M6528; 75AM65 (Marincovich field #)
Where: Lituya County, Alaska (58.6° N, 137.6° W: paleocoordinates 58.4° N, 133.2° 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, calcareous siltstone and lithified, calcareous 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 37383: authorized by Austin Hendy, entered by Austin Hendy on 14.03.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Turbinidae indet. Rafinesque 1815 snail | |
Calliostoma sp. Swainson 1840 top snail | |
? Colus sp. Röding 1798 true whelk | |
Fusitriton oregonensis Redfield 1846 triton shell | |
"Natica (Cryptonatica) clausa" = Cryptonatica affinis
"Natica (Cryptonatica) clausa" = Cryptonatica affinis Gmelin 1791 moon snail | |
Bivalvia | |
? Chlamys sp. Röding 1798 scallop | |
Lucinoma acutilineata Conrad 1849 clam | |
? Periploma sp. Schumacher 1816 clam | |
Spisula addicotti clam
? Spisula sp. Gray 1837 clam | |
Macoma (Macoma) golikovi Scarlato and Kafanov 1988 tellin clam
"Macoma aff. twinensis" = Macoma (Macoma) twinensis Clark 1925 tellin clam
Macoma aff. albaria Conrad 1849 tellin clam | |
Acila (Truncacila) taliaferroi divaricate nutclam | |
Nuculana (? Sacella) sp. Link 1807 pointed nut clam | |
Echinoidea | |
Clypeasterina indet. Agassiz 1872 sand dollar | |
Pisces | |
"Pisces indet." = Osteichthyes
"Pisces indet." = Osteichthyes Huxley 1880 bony fish |