Where: Medfra County, Alaska (63.3° N, 154.5° W: paleocoordinates 2.5° N, 46.0° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Polygnathus dehiscens conodont zone, Limestone Mountain Formation, Early/Lower Emsian (409.1 - 402.5 Ma)
• On the basis of regional stratigraphic correlations and faunal composition, the host beds appear to be slightly younger than the earliest Emsian (Polygnathus dehiscens Zone) Soda Creek Limestone (Blodgett et al., 2000).
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•(This would be Polygantuhs gronbergi/P. excavatus zone, or 406-403.5 Ma on Gradstein et al.)
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•Note also that "Limestone Mountain" is an informal name.
• bed-level stratigraphic resolution
Environment/lithology: limestone
•
•The dominance of the fauna by a highly diverse assemblage of gastropods, together with the abundance of the tubular stromatoporoid genus Amphipora in underlying and overlying strata, indicates a relatively shallow-water (shallow part of the photic zone), inner carbonate platform environment. (Fryda & Blodgett 2004:111)
Size class: macrofossils
Preservation: replaced with silica
Reposited in the USNM
• Cobbled together from multiple taxonomy papers
Primary reference: R. B. Blodgett and D. M. Rohr. 1989. Two new Devonian spine-bearing pleurotomariacean gastropod genera from Alaska. Journal of Paleontology 63(1):47-52 [P. Wagner/P. Wagner/P. Wagner]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 49107: authorized by Pete Wagner, entered by Pete Wagner on 08.04.2005, edited by Sarah Kolbe
Creative Commons license: CC BY (attribution)
Taxonomic list
Demospongiae | |
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Stromatoporoidea | |
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Anthozoa | |
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Ostracoda | |
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? Scaphina sp. ostracod | |
? Libumella sp. Rozhdestvenskaya 1959 ostracod | |
? Eomoelleritia sp. Abushik 1972 ostracod | |
Scaphopoda | |
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Bivalvia | |
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Gastropoda | |
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Medfrazyga clauticae n. gen. n. sp.4, "Palaeozygopleura (Rhenozyga) reifenstuhli n. sp." = Rhenozyga reifenstuhli4
"Palaeozygopleura (Rhenozyga) reifenstuhli n. sp." = Rhenozyga reifenstuhli4 Frýda and Blodgett 2004 snail | |
"Quadricarina (? Quadricarina) noklebergi n. sp." = Quadricarina noklebergi4, Alaskiella medfraensis n. gen. n. sp.2
"Quadricarina (? Quadricarina) noklebergi n. sp." = Quadricarina noklebergi4 Frýda and Blodgett 2004 snail | |
Chlupacispira spinosa n. gen. n. sp., Arctozone cooki n. gen. n. sp.4, Balbinipleura krawczynskii n. sp.4
Chlupacispira spinosa n. gen. n. sp. Blodgett and Rohr 1989 snail | |
Farewellia heidelbergerae n. gen. n. sp.4
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Kuskokwimia moorei n. gen. n. sp.3
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"Straparollus (Eleutherospira) medfraensis" = Eleutherospira medfraensis1 Blodgett and Johnson 1992 snail | |
Cephalopoda | |
Cephalopoda indet.5 Cuvier 1797 | |
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Tentaculitida indet.5 Ljaschenko 1955 | |
Brachiopoda | |
Brachiopoda indet.5 Cuvier 1805 |