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Journal of Paleontology; March 2009; v. 83; no. 2; p. 293-298; DOI: 10.1666/08-079R1.1
© 2009 Paleontological Society
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PALEONTOLOGICAL NOTES

Emsian (Late Early Devonian) Sponges from West-Central and South-Central Alaska

J. Keith Rigby1, Robert B. Blodgett2 and Nicolle K. Anderson1

1 Room 165, Earth Science Museum, Department of Geological Sciences, Brigham Young University, Provo, Utah 84602-4606, <rigbyjkeith@gmail.com> and <nikki.anderson2@gmail.com>
2 U.S. Geological Survey—Contractor, 4200 University Drive, Anchorage, Alaska, <rblodgett@usgs.gov>

The first 20% of the full text of this article appears below.


   INTRODUCTION
 
RELATIVELY COMMON specimens of the hypercalcified agelasiid sponge Hormospongia labyrinthica Rigby and Blodgett, 1983 and specimens of associated species of Hormospongia have been previously reported from Emsian and Eifelian stratigraphic units at several localities in south-central and southeastern Alaska (Rigby and Blodgett, 1983). Those sponges were first described from the type section of the Eifelian Cheeneetnuk Limestone in the McGrath A-5 quadrangle. Since then several additional specimens of Hormospongia labyrinthica have also been collected from a new locality in the Talkeetna C-6 quadrangle in south-central Alaska (Figs. 1, 2.1), and are documented here.


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  		 FIGURE 1—Generalized map of Alaska showing relative positions of sponge Localities 1 and 2 in west-central Alaska. Locality 1 is in the Shellabarger Pass area, Talkeetna C-6 Quadrangle, south-central Alaska, and Locality 2 is in the Limestone Mountain area, Medfra B-3 Quadrangle, in west-central Alaska

 

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  		 FIGURE 2—Topographic maps showing positions of localities from which the sponges reported here were collected. 1, Locality 1, arrow, unnamed late Emsian limestone, in sec. 15, T28N, R18W, Shellabarger Pass area, Talkeetna C-6 Quadrangle; and 2, Locality 2, arrow, unnamed late Emsian limestone, in sec. 6, T26S, R23E, south flank of Limestone Mountain, Medfra B-3 Quadrangle, Alaska

 
A few specimens of the new genus and species, Medfraspongia tubulara, a calcareously preserved, possibly verticillitid, sponge are also documented here. This taxon is based on a few moderately complete specimens and numerous fragments collected from an unnamed Emsian limestone exposed on the south flank of Limestone Mountain in the Medfra B-4 quadrangle of west-central Alaska (Figs. 1, 2.2).

In both these occurrences, gastropods are the most common faunal element, along with abundant calcareous algae, that are indicative of shallow water in a possibly lagoonal, tropical paleoenvironmental setting. It . . . [Full Text of this Article]






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