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Journal of Paleontology; May 2000; v. 74; no. 3; p. 386-393; DOI: 10.1666/0022-3360(2000)074<0386:AVMOSS>2.0.CO;2
© 2000 Paleontological Society
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A VARIED MIDDLE ORDOVICIAN SPONGE SPICULE ASSEMBLAGE FROM WESTERN NEWFOUNDLAND

XI-GUANG ZHANG1 and BRIAN R. PRATT1

1 Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada, <xgzhang@sprint.ca>, <brian.pratt@usask.ca>

Abundant and morphologically fairly diverse siliceous sponge spicules of Darriwilian (Middle Ordovician) age were collected from the Table Cove Formation of Port au Port Peninsula, western Newfoundland. Without co-occurrence of appropriate sponge body fossils, it is difficult to refer these disarticulated sponge spicules to existing or to new taxa. However, representatives of demosponges and hexactinellids are recognized. While marked differences are noted between older and younger lithistid dendroclones, for example, spicule form in these Middle Ordovician specimens is similar overall to previously known assemblages of various ages, demonstrating the morphologically conservative nature of the spicular skeleton.




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