Conostichus ornatus

    These beautiful occurrences of Conostichus ornatus (?)  are found on the top bedding surface within a wave-dominated deltaic shoreface (Wall Creek Member of the Frontier Formation, Powder River Basin, Wyoming).  These trace-fossils are interpreted as Bergaueria - resting imprints - that preserve cnidarian basal pedal imprints.  Note the twelve fold radial symmetry of the physa.  Other investigators have argued that these impressions should be interpreted as "button corals" -- which, are common in the Cretaceous rock record.  I would refer the reader to the following two images taken of a modern captive carpet anemone (Stichodactyla haddoni).  The individual organism in the lower images has attached itself to the side of the aquarium glass and the radial pattern in soft-tissue structures (physa) are easily seen.  The first image provides scale and the second image is provided for detailed viewing of the of the organism's pedal disk.

   

www.clastics.com home page


copyright Chuck D. Howell, Jr. 2001-2022

No part of this website or any information contained may be used or reproduced without written permission from Chuck D. Howell.  Figures and information may not be posted on other websites and/or publications.  Proper citation is required.