| Sample: |
Sample No. No Data
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| Locality: |
Field No. No Data
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| Description: |
No locality description provided, but Fig. 1 (of Rohr and Potter, 1987 and Rohr, 1988) shows position of locality in the Teller (B-4) 1:63,360 quadrangle |
| Location: |
Alaska Quadrangle: Teller B-4 Township&Range: T1N R40W Section: NE1/4NE1/4 sec. 4 |
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Reference
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| Title: |
Upper Ordovician gastropods from the Seward Peninsula
,
1988
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Abstract--Thirty-three species of Upper Ordovician gastropods are described from shallow-water carbonate facies of the Seward Peninsula, Alaska. New species include Helicotoma blodgetti, H. robinsoni, Ecculiomphalus? potteri, Pachystrophia spiralis, Raphistoma tellerensis, and Trochonemella reusingi. Sinutropis is previously known only from the Upper Silurian of Bohemia, and Daidia and Ophiletina are previously known only from the Middle Ordovician of eastern North America. Most of the genera are cosmopolitan forms similar to other Middle and Upper Ordovician North American gastropod faunas. |
| Report by: |
David M. Rohr
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| | Age: | Cincinnatian (Late Ordovician (Cincinnatian)) |
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| Comment: | The age of the gastropod-bearing strata at the various sites is considered to be Late Ordovician. Locality 36394 produced Cincinnatian (Late Ordovician) conodonts (S.M. Bergstrom, personal commun.), the brachiopod Austinella n. sp. (identified by A.W. Potter), and the gastropods Trochonemella and Rousseauspira (identified by Rohr). |
| Occurrence(s) |
| No. |
Group |
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Name |
Qty |
Notes |
| 1 |
Snails |
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Tropidodiscus aff. T. subacutus (Ulrich, 1897) |
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| 2 |
Snails |
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Maclurites aff. M. manitobensis Whiteaves, 1890 |
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| 3 |
Snails |
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Maclurites operculum cf. M. manitobensis Whiteaves, 1890 |
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| 4 |
Snails |
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Helicotoma blodgetti n. sp. |
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| 5 |
Snails |
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Helicotoma robinsoni n. sp. |
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| 6 |
Snails |
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Ophiletina aff. O. sublaxa Ulrich and Scofield, 1897 |
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| 7 |
Snails |
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Lytospira sp. |
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| 8 |
Snails |
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Pachystrophia spiralis n. sp. |
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| 9 |
Snails |
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Raphistoma tellerensis n. sp. |
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| 10 |
Snails |
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Liospira aff. L. decipiens Ulrich in Ulrich and Scofield, 1897 |
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| 11 |
Snails |
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Loxoplocus (Lophospira) serrulata Salter, 1859 |
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| 12 |
Snails |
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Trochonemella aff. T. churkini Rohr and Blodgett, 1985 |
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| 13 |
Snails |
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Ruedemannia aff. R. lirata (Ulrich and Scofield, 1897) |
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| 14 |
Snails |
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Cataschisma exquisita (Lindstrom, 1884) |
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| 15 |
Snails |
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Trochonema (Trochonema) aff. T.(T.) umbilicatum (Hall, 1847) |
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| 16 |
Snails |
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Gyronema historicum (Hudson, 1905) |
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| 17 |
Snails |
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Genus aff. Oriostoma sp. |
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| 18 |
Snails |
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Murchisonia sp. |
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| 19 |
Snails |
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Ectomaria cf. E. pagoda (Salter, 1859) |
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| 20 |
Snails |
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Subulites (Cyrtospira) sp. |
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| 21 |
Snails |
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Subulites (Fusispira?) sp. |
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| 22 |
Snails |
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Rousseauspira teicherti Rohr and Potter, 1987 |
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| 23 |
Snails |
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Indeterminate operculum |
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The operculum is multispiral and distinct from Maclurites and other horn-shaped Ordovician opercula. It has a counter-clockwise spiral which would be consistent with a dextral, operculate gastropod such as Oriostoma |
| 24 |
Brachiopods |
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Austinella n. sp. |
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(identified by A.W. Potter) |
| 25 |
Conodonts |
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Conodonts |
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(identified by S.M. Bergstrom as being of Cincinnattian (Late Ordovician) age) |
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| Title: |
Rousseauspira: new gastropod operculum from the Ordovician of Alaska and California
,
1987
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Abstract--Rousseauspira teicherti, a new genus and species of an unusual, untwisted, horn-shaped gastropod operculum from shallow-subtidal limestone of the Upper Ordovician of Alaska and the Middle Ordovician of California, is described and compared to two other Ordovician opercula, Ceratopea Ulrich, 1911, and Teiichispira Yochelson and Jones, 1968. The shell to which the operculum belonged is not yet known. |
| Report by: |
David M. Rohr
,
A. W. Potter
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| | Age: | Late Ordovician |
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| Comment: | Using biostratigraphic data of Potter and W.A. Oliver, Jr. (personal commun.), and idealized stratigraphic section was constructed from map cross sections under the assumption, probably incorrect, that no faults exist between the various localities. This section place locality 36407 approximately 120 m stratigraphically below the local Ordovician-Silurian boundary and locality 36394a anywhere from 1 to 25 m stratigraphically above 36407. (from p. 284) The age of the operculum-bearing strata at various sites is considered to be Late Ordovician. Locality 3694b produced Cincinnatian (Late Ordovician) conodonts (S.M. Bergstrom, personal commun.), the brachiopod Austinella n. sp., and the gastropods Trochonemella and Rousseauspira. Austinella n. sp., Trochonemella, and Rousseauspira also occur at localities 36395, 36407, and 36433, leading us to assign a Late Ordovician age to these localities as well. (from p. 284-285) In some cases the suffixes -a, -b, etc. have been informally added to the five-digit locality number to denote small areas or outcrops relatively close together. (from p. 284) [Note by R.B. Blodgett: This locality, USNM loc. 36394b, was later cited in Rohr (1988) as USNM 36394. - I prefer to drop the suffix as conversations with the collector, Al Potter, indicate that these really probably represented separate rubble blocks from approximately the same spot] |
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