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Chancelloria, an Enigmatic Fossil from the Bright Angel Shale (Cambrian) of Grand Canyon, Arizona
David K. Elliott and Daryl L. Martin
Journal of the Arizona-Nevada Academy of Science
Vol. 21, No. 2 (1987), pp. 67-72
Published by: Arizona-Nevada Academy of Sciences
Stable URL: http://www.jstor.org/stable/40024887
Page Count: 6
You can always find the topics here!Topics: Shales, Canyons, Sandstones, Fossils, Geology, Sponges, Limestones, Paleontology, Mollusks, Stratigraphy
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Calcareous spicules from the Cambrian Bright Angel Shale of Grand Canyon, Arizona are identified as Chancelloria, an enigmatic fossil initially described by Walcott (1920) as a sponge. More recent work has suggested that the mode of growth of this organism is unlike that found in sponges and that it is in fact allied to other problematic Cambrian organisms that produced similar sclerites. The structure of the specimens from Grand Canyon supports that view, and they are therefore assigned to the class Coeloscleritophora (Bengtson and Missarzhevsky 1981) Phylum unknown.
Journal of the Arizona-Nevada Academy of Science © 1987 Arizona-Nevada Academy of Sciences