New Haven's Sentinels by Zeilinga de Boer Jelle. Wareham John

Author:Zeilinga de Boer, Jelle.,Wareham, John.
Language: eng
Format: epub
Publisher: Wesleyan University Press
Published: 2013-03-17T04:00:00+00:00

36A. Photograph of the south front of West Rock. Photographed by Professor William M. Davis for the United States Geological Survey.

This photo, taken in the 1920’s when a large quarry operated in the area, shows the contact between two sills, a lower relatively thin intrusion, and a much thicker second body with massive columns overlying a tilted sequence of sandstone layers.

36B. Sketch of the contact between the older West Rock sill and underlying sediments. (James Dwight Dana, 1891.)

This close-up shows how the lower, earlier diabase sill intruded into the layered sediment sequence by “stepping up” from older onto younger sandstone beds. After emplacement, the entire sequence was tilted ca. 20 degrees eastward.

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