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Authors: Rohr, David M. , Blodgett, Robert B.
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Date: /1985
Title: Upper Ordovician Gastropoda from west-central Alaska
59 , 3 , 667-673 , 4 figs.
Host: Journal of Paleontology :
Document Type: Article\Abst.\Chapter\report
Annotation: Abstract--A brachiopod-gastropod assemblage of Late Ordovician age from the Lone Mountain area, McGrath quadrangle, west-central Alaska contains 15 species of gastropods including Pseudocryptaenia? majewskei n. sp. and Trochonemella churkini n. sp. In addition to the typical Ordovician gastropods present, such as Maclurites, three genera previously known only from the Silurian were recovered: Euomphalopterus, Pseudophorous, and Oriostoma?. The fauna is from strata that have been interpreted by some as being allochthonous in relation to cratonic North America. The paleobiogeographic affinities of the gastropods are not conclusiveby themselves, but are consistent with our view, supported by the paleobiogeographic affinities of other Paleozoic faunas of the region and lithofacies analysis and paleomagnetism, that these strata are part of a southwest-trending miogeoclinal belt that extends along the Paleozoic North America continental margin from Canada and east-central Alaska across the Tintina Fault into southwestern and Interior Alaska.
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No Data , Mc Grath , A silicified megafossil bed about 1 meter thick in an unnamed limestone. Exposed along the ridgecrest west of Long Mountain, Alaska at longitude 154 deg. 50'33"W, latitude 62 deg. 31'59"N, center of SW1/4, NE1/4 of sec. 9, T28N, R30W, McGrath C-4 quadrangle. This locality was discovered and collected by geologists of Arco Alaska, Inc., and subsequently recollected by R.B. Blodgett.
Tropidodiscus sp.
Maclurites sp.
?Pachystrophia cf. P. devexa (Eichwald, 1859)
Paraliospira aff. P. planata Rohr, 1980
Loxoplocus (Lophospira) cf. L. (L.) perangulata (Hall, 1847)
Trochonemella churkini n. sp.
Pseudocryptaenia? majewskei n. sp.
Euomphalopterus sp.
Trochonema (Trochonema) aff. T.(T.) retrorsum Ulrich and Scofield, 1897
Trochonema (Eunema) sp. A
Trochonema (Eunema) sp. B
Gyronema sp.
Oriostoma? cf. O. angulatum (Wahlenberg, 1818)
Ectomaria cf. E. prisca (Billings, 1865)
Pseudophorus cf. P. profundus (Lindstrom, 1884)
Tcherskidium sp.
dolerothid
Paleofavosites sp.
Mesofavosites sp.
Syringoporinus sp.
Catenipora sp.
Tryplasma sp. cf. T. sp. Oliver in Oliver et al. (1975)
Panderodus cf. P. gracilis (Branson and Mehl)
Drepanoistodus suberectus (Branson and Mehl)
Belodina sp.
hindeodelliform element, probably from Ozarkodina sp.
zygognathiform element of unknown affinity