Ordovician sponges from west-central and east-central Alaska and western Yukon Territory, Canada
Bulletin of Geosciences
By: J.K. Rigby, R. B. Blodgett, and B.B. Britt
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Abstract
Moderate collections of fossil sponges have been recovered over a several-year period from a few scattered localities in west-central and east-central Alaska, and from westernmost Yukon Territory of Canada. Two fragments of the demosponge agelasiid cliefdenellid, Cliefdenella alaskaensis Stock, 1981, and mostly small unidentifiable additional fragments were recovered from a limestone debris flow bed in the White Mountain area, McGrath A-4 Quadrangle in west-central Alaska. Fragments of the agelasiid actinomorph girtyocoeliids Girtyocoeliana epiporata (Rigby & Potter, 1986) and Girtyocoelia minima n. sp., plus a specimen of the vaceletid colospongiid Corymbospongia amplia Rigby, Karl, Blodgett & Baichtal, 2005, were collected from probable Ashgillian age beds in the Livengood B-5 Quadrangle in east-central Alaska. A more extensive suite of corymbospongiids, including Corymbospongia betella Rigby, Potter & Blodgett, 1988, C. mica Rigby & Potter, 1986, and C.(?) perforata Rigby & Potter, 1986, along with the vaceletiid colospongiids Pseudo-imperatoria minima? (Rigby & Potter, 1986), and Pseudoimperatoria media (Rigby & Potter, 1986), and with the heteractinid Nucha naucum? Pickett & Jell, 1983, were recovered from uppermost part of the Jones Ridge Limestone (Ashgillian), on the south flank of Jones Ridge, in the Sheep Mountain Quadrangle, in westernmost Yukon Territory, Canada. The fossil sponges from the McGrath A-4 and Livengood B-5 quadrangles were recovered from attached Siberian terranes, and those from the Sheep Mountain Quadrangle were recovered from an allochthonous Laurentian terrane in the Yukon Territory.
Suggested Citation
Rigby, J., Blodgett, R.B., Britt, B., 2008, Ordovician sponges from west-central and east-central Alaska and western Yukon Territory, Canada: Bulletin of Geosciences, v. 83, no. 2, p. 153-168, https://doi.org/10.3140/bull.geosci.2008.02.153.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Ordovician sponges from west-central and east-central Alaska and western Yukon Territory, Canada |
| Series title | Bulletin of Geosciences |
| DOI | 10.3140/bull.geosci.2008.02.153 |
| Volume | 83 |
| Issue | 2 |
| Year Published | 2008 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Bulletin of Geosciences |
| First page | 153 |
| Last page | 168 |