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Early Cambrian sponges from Vermont and Pennsylvania, the only ones described from North America

Published online by Cambridge University Press:  19 May 2016

J. Keith Rigby
J. Keith Rigby*
Affiliation:
Department of Geology, Brigham Young University, Provo, Utah 84602
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Abstract

Early Cambrian Leptomitus zitteli Walcott, 1886, is a tubular, double-walled, demo-sponge from the Parker Slate of Vermont and is one of the few intact sponges of that age known. It occurs with skeletal fragments of ?Protospongia hicksi Hinde, 1887. Hazelia walcotti (Resser and Howell, 1938) is a thin-walled, tubular sponge with crudely clustered oxeas in a thatched skeleton. It is known from the Kinzers Formation of Pennsylvania. Early occurrences of Leptomitus and Hazelia indicate that at least these two lineages had diverged by the latter part of the Early Cambrian. The impression described as Leptomitus minor by Resser and Howell (1938) lacks spicules and is not a sponge.

Type
Research Article
Information
Journal of Paleontology , Volume 61 , Issue 3 , May 1987 , pp. 451 - 461
Copyright
Copyright © The Paleontological Society 

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