The ichnogenus Tremichnus in the Lower Silurian of western New York |
| |
Authors: | JAMES D. ECKERT |
| |
Affiliation: | Department of Geological Sciences, University of Rochester, Rochester, New York 14627, U.S.A. |
| |
Abstract: | Discovery of Tremichnus cysticus Brett on a crinoid pluricolumnal from the Willowvale Shale of western New York extends the range of this ichnogenus into the Lower Silurian. Pits attributable to Tremichnus apparently represent embedment sites of parasites or commensalistic, filter-feeding organisms of unknown affinities. Embedment of T. cysticus may have been accomplished by localized inhibition of stereom growth within the pits aided by secretion of substances that stimulated accretion of stereom by the host pelmatozoan in areas immediately surrounding the pits. |
| |
Keywords: | Tremichnus cysticus Lower Silurian western New York occurrence paleoecology |
|
|