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Authors: |
Blodgett, Robert B.
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Cook, Alex G.
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| Editors: |
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| Date: |
/2002 |
| Title: |
Cheeneetnukiidae, a new Middle Devonian murchisonioid gastropod family, including the new genera Cheeneetnukia and Ulungaratoconcha based on representatives from Alaska and Australia |
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48 , 1 , 17-28 , 4 figs. |
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| Document Type: |
Article\Abst.\Chapter\report |
| Annotation: |
Two new genera of murchisonioid gastropods, Cheeneetnukia and Ulungaratoconcha, are established from the Middle Devonian (Eifelian and Givetian) strata of the Old World Realm and are placed in Cheeneetnukiidae fam. nov. belonging to the Murchisonioidea. Cheeneetnukiidae represent a distinctive group of Middle Devonian murchisonioids characterized by a squared-off (rectangular) whorl profile, a flattened vertical outer whorl surface with a broad, centrally situated selenizone which is bounded above and below by strong angulations, often in the form of flange-like projections. Strongly ornate (nodose or spinose) forms are common amongst the younger Givetian representatives of the family. The family underwent an explosive adaptive radiation of intricate and highly decorated forms that are restricted to the Middle Devonian (Eifelian and Givetian). The family is characteristic for warm tropical seaways of the Middle Devonian, and its representatives are known from Germany, various accreted Alaskan terranes (Farewell, Alexander and Arctic Alaska), northeastern Australia, Malaysia and southern China. Three new species are here described: 1) the type species of Cheeneetnukia, C. frydai from the Eifelian of Alaska, known from both the Cheeneetnuk Limestone of west-central Alaska (Nixon Fork subterrane of the Farewell terrane) and the Wadleigh Limestone from southeastern Alaska (Alexander terrane); 2) C. australis from the uppermost Dosey Limestone (early Givetian) of north Queensland, Australia; and 3) the type species of Ulungaratoconcha, U. heidelbergeri from Eifelian strata of the Ulungarat Formation (Member A), northeastern Brooks Range, northeastern Alaska (Arctic Alaska terrane). |
| UserNote |
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79RB8
(10061-SD)
, Mc Grath
, Long. 155 deg. 09'23"W, Lat. 62 deg. 04'33"N. NE1/4, NW 1/4, NE1/4, NW1/4 sec. 21, T23N, R32W. Approximately 3.0 m (10 ft) thick silicified fossil horizon, the top of which is 101.5 m (333 ft) below the top of the Cheeneetnuk Limestone. (description from Rigby and Blodgett, 1983, p. 774)
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Cheeneetnukia frydai n. sp.
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79RB9
(10062-SD)
, Mc Grath
, Long. 155 deg. 09'23"W, Lat. 62 deg. 04'33"N. NE1/4, NW1/4, NE1/4, NW1/4 sec. 21, T23N, R32W. Silicified fossil horizon, approximately 3.0 m (10 ft) thick, the top of which is 81.7 m (268 m) below the top of the Cheeneetnuk Limestone. (description from Rigby and Blodgett, 1983, p. 774)
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Cheeneetnukia frydai n. sp.
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68AEs596
(M1299-SD and 8254-SD)
, Craig
, The locality is situated on the shoreline of a small islet in the NW1/4, NE1/4, section 34, T70S, R79E, Craig D-4 quadrangle. Collected in Eifelian strata of the Wadleigh Limestone by J. Evans of the USGS in 1968 (description modified from Blodgett and Cook, 2002, p. 23) [Karheen Narrows area, 1.82 miles at 093 degrees from triangulation station Quince. (description from Pojeta's E&R report)]
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Cheeneetnukia frydai n. sp.
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89A-126A1
, Demarcation Point
, From the Ulangarat Formation (Anderson, 1991), within member A, the lowest and only marine unit of the four members. Collection derived from a 14 m thick interval of chert arenite and siltstone with thin interbds of mudstone that forms the base of her measured section 89A-118, situated at and just below the 6,000 foot contour elevation in the SW1/4, NW1/4, SE1/4, section 16, T5S, R37E, Demarcation Point A-4 quadrangle. This interval comprises the lowermost in-place outcrop above a loose scree scree slope.
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Ulungaratoconcha heidelbergeri n. sp.
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