Sedimentary Geology


Carlton Brett (University of Cincinnati) Looking Close at Poland Limestone Member of the Denley Formation.

Photograph by: Tom Whiteley



The rocks of the Trenton Group are called limestones, but are sedimentologically more complex than simple limestones. Within the succession of rocks along West Canada Creek from Trenton Falls to Prospect, New York, the Trenton Group is composed of mixed siliciclastic and carbonate rock types. Key sedimentologic differences exist within the seemingly monotonous mass of bedded rocks. Subtle differences in bedding styles, sedimentary textures and compositions, as well as in sedimentary structures and fossil composition provide the observant geologist with many clues for interpreting the depositional histories of these rocks. Using such clues, generations of geologists have begun to unravel the processes responsible for depositing the sediments from which these rocks were formed, and the environments within which they were finally buried.

The sections: Lithology, Sedimentary Processes and Structures, Depositional Environments and Stratigraphy are presented in order to provide the reader with a primer in the sedimentology of mixed carbonate-siliciclastic succession, as well as an understanding of the approximate range of sedimentary rocks deposited within the Trenton Group as exposed in the Trenton gorge region. The discussion of sedimentary rocks herein is designed to be integrated into the discussion of the stratigraphy of Trenton Falls, and many links are provided throughout the text to facilitate the process of connecting the rock characteristics to the stratigraphic succession within which they occur.



© 2004 President and Fellows of Harvard College