83RB9, south flank of Limestone Mountain: Early Emsian, Alaska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
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Brachiopoda indet.
Cuvier 1805
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Rigby et al. 2009 | |||||||||
Tentaculitida
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Tentaculitida indet.
Ljaschenko 1955
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Rigby et al. 2009 | |||||||||
Gastropoda
- Murchisoniina
- Gosseletinidae
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Chlupacispira spinosa n. gen., n. sp.
Blodgett and Rohr 1989
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3 specimens | |||||||||
Balbinipleura krawczynskii n. sp.
Frýda and Blodgett 2004
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Frýda and Blodgett 2004 | 1 specimen | ||||||||
Arctozone cooki n. gen., n. sp.
Frýda and Blodgett 2004
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Frýda and Blodgett 2004 | 4 specimens | ||||||||
Gastropoda
- Murchisoniina
- Porcelliidae
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Quadricarina (? Quadricarina) noklebergi n. sp.
Frýda and Blodgett 2004
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Frýda and Blodgett 2004 | 5 specimens | ||||||||
Alaskiella medfraensis n. gen., n. sp.
Frýda and Blodgett 1998
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Frýda and Blodgett 1998 | 9 specimens | ||||||||
Gastropoda
- Murchisoniina
- Murchisoniidae
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Farewellia heidelbergerae n. gen., n. sp.
Frýda and Blodgett 2004
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Frýda and Blodgett 2004 | 4 specimens | ||||||||
Gastropoda
- Murchisoniina
- Palaeozygopleuridae
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Palaeozygopleura (Rhenozyga) reifenstuhli n. sp.
Frýda and Blodgett 2004
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Frýda and Blodgett 2004 | 5 specimens | ||||||||
Medfrazyga clauticae n. gen., n. sp.
Frýda and Blodgett 2004
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Frýda and Blodgett 2004 | 4 specimens | ||||||||
Gastropoda
- Murchisoniina
- Soleniscidae
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Nanochilina gubanovi n. sp.
Frýda and Blodgett 2004
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Frýda and Blodgett 2004 | 3 specimens | ||||||||
Alaskacirrus bandeli n. gen., n. sp.
Frýda and Blodgett 1998
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Frýda and Blodgett 1998 | 15 specimens | ||||||||
Gastropoda
- Kuskokwimiidae
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Kuskokwimia moorei n. gen., n. sp.
Frýda and Blodgett 2001
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Frýda and Blodgett 2001 | |||||||||
Gastropoda
- Euomphalina
- Euomphalidae
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Euomphalopterus sp.
Roemer 1876
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Frýda and Blodgett 1998 | |||||||||
Straparollus (Eleutherospira) medfraensis
Blodgett and Johnson 1992
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Blodgett and Johnson 1992 | |||||||||
Gastropoda
- Euomphalina
- Pseudophoridae
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Decorospira lepaini n. sp.
Frýda and Blodgett 2004
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Frýda and Blodgett 2004 | 3 specimens | ||||||||
? Decorospira minutula n. sp.
Frýda and Blodgett 2004
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Frýda and Blodgett 2004 | 1 specimen | ||||||||
Bivalvia
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Bivalvia indet.
Linnaeus 1758
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Rigby et al. 2009 | |||||||||
Scaphopoda
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Scaphopoda indet.
Bronn 1862
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Rigby et al. 2009 | |||||||||
Cephalopoda
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Cephalopoda indet.
Cuvier 1797
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Rigby et al. 2009 | |||||||||
Ammonoidea indet.
(Zittel 1884)
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Rigby et al. 2009 | |||||||||
Ostracoda
- Palaeocopida
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? Scaphina sp.
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Ostracoda
- Palaeocopida
- Miltonellidae
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? Libumella sp.
Rozhdestvenskaya 1959
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Ostracoda
- Palaeocopida
- Beyrichiidae
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Beyrichia (Scabribeyrichia) churkini
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Berdan & Copeland 1973 | ||||||||||
Ostracoda
- Palaeocopida
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Nezamyslia aff. jucunda
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Polenova 1974 | ||||||||||
Ostracoda
- Leperditicopida
- Moelleritiidae
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? Eomoelleritia sp.
Abushik 1972
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Anthozoa
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Tabulata indet.
(Milne-Edwards and Haime 1850)
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Rigby et al. 2009 | |||||||||
Anthozoa
- Rugosa
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Rugosa indet.
Milne-Edwards and Haime 1850
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Rigby et al. 2009 | |||||||||
Demospongiae
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Medfraspongia tubulara
Rigby et al. 2009
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Rigby et al. 2009 | |||||||||
Stromatoporoidea
- Amphiporida
- Amphiporidae
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Amphipora sp.
Schulz 1883
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Frýda and Blodgett 2004 | |||||||||
see common names |
Geography
Country: | United States | State/province: | Alaska | County: | Medfra |
Coordinates: | 63.3° North, 154.5° West (view map) | ||||
Paleocoordinates: | |||||
Basis of coordinate: | stated in text | ||||
Altitude: | 1700 feet | ||||
Geographic resolution: | outcrop |
Time
Period: | Devonian | Epoch: | Early Devonian |
Stage: | Emsian | 10 m.y. bin: | Devonian 2 |
Key time interval: | Early Emsian | Conodont zone: | Polygnathus dehiscens |
Age range of interval: | 407.6 - 398.3 m.y. ago |
Stratigraphy
Formation: | Limestone Mountain | ||||
Local section: | Limestone Mountain | Local bed: | 13.7 - 15.2 m | ||
Local order: | bottom to top | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: 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).
(This would be Polygantuhs gronbergi/P. excavatus zone, or 406-403.5 Ma on Gradstein et al.) Note also that "Limestone Mountain" is an informal name. |
Lithology and environment
Primary lithology: | "limestone" |
Lithology description: 1.5 m thick, silicified, richly fossiliferous rubble zone in an unnamed Devonian limestone unit; eurekaensis / delta conodont zones (Fryda & Blodgett 2004). | |
Environment: | carbonate indet. |
Geology comments: Transitional biofacies from the more open-marine environment below into the restricted lagoonal facies above.
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) |
Taphonomy
Modes of preservation: | replaced with silica |
Size of fossils: | macrofossils |
Collection methods and comments
Collection excludes: | some macrofossils,some microfossils |
Reason for describing collection: | taxonomic analysis |
Museum repositories: | USNM |
Collection method comments: Cobbled together from multiple taxonomy papers |
Metadata
Database number: | 49107 | ||
Authorizer: | P. Wagner, A. Miller | Enterer: | P. Wagner, S. Kolbe |
Modifier: | P. Wagner | Research group: | marine invertebrate |
Created: | 2005-04-08 15:47:56 | Last modified: | 2016-09-08 20:28:11 |
Access level: | the public | Released: | 2005-04-08 15:47:56 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
13130. | 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] |
Secondary references:
255 | R. B. Blodgett and J. G. Johnson. 1992. Early Middle Devonian (Eifelian) Gastropods of Central Nevada. Palaeontographica Abteilung A 222:85-139 [P. Wagner/P. Wagner/P. Wagner] | |
13129 | J. Frýda and R. B. Blodgett. 1998. Two new cirroidean genera (Vetigastropoda, Archaeogastropoda) from the Emsian (late Early Devonian) of Alaska with notes on the Early Phylogeny of Cirroidea. Journal of Paleontology 72(2):265-273 [P. Wagner/P. Wagner/P. Wagner] | |
13128 | J. Frýda and R. B. Blodgett. 2001. The oldest known heterobranch gastropod, Kuskokwimia gen. nov., from the Early Devonian of west-cetnral Alaska, with notes on the early phylogeny of higher gastropods. Bulletin of the Czech Geological Survey 76(1):39-53 [P. Wagner/P. Wagner/P. Wagner] | |
13132 | J. Frýda and R. B. Blodgett. 2004. New Emsian (Late Early Devonian) gastropods from Limestone Mountain, Medfra B-4 Quadrangle, west-central Alaska (Farewell Terrane) and their paleobiogeographic affinities and evolutionary significance. Journal of Paleontology 78(1):111-132 [P. Wagner/P. Wagner/S. Kolbe] | |
34239 | 0 | J. K. Rigby, R. B. Blodgett, and N. K. Anderson. 2009. Emsian (Early Late Devonian) sponges from west-central and south-central Alaska. Journal of Paleontology 83(2):293-298 [A. Miller/S. Kolbe] |