March Meeting

Thursday, May 17th, 2017
Speaker: Dr. Byron Stone, USGS
Topic: Gay Head Lighthouse – Evidence for the Last Two Glacial Events on Martha’s Vineyard

Previous studies of the glaciotectonized Coastal Plain and glacial deposits on Martha’s Vineyard emphasized the multiple (4-5?) glacial events recorded there. Recent exposures at Gay Head lighthouse showed that the Gay Head moraine in Aquinnah is a palimpsest feature beneath thin late Wisconsinan glacial deposits, further indicating that the correlated high morainal hills of Chilmark date from the same older glacial advance, probably Ilinoian in age. The Gay Head Lighthouse was the subject of an episode of NOVA last year.

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