Photo 2: Composition and structure inside the Tracy Corners
moraine; northwest-southeast oriented face, looking northeast; exposure height approximately 15 meters. Stratified sand and gravel layers are tilted to right (south) in lower right of photo and represent deposition of coalesced glaciomarine fans at the ice-margin. Subsequent overiding by the glacier is represented by the folded and offset rusty layers in photo center, overlain by boulders and gravel. Thrust faults and folds in these sediments were formed when the ice moved over the top from north to south (left to right in photo). After the ice had melted, the Maine coast gradually rose back to its original elevation and the landform emerged from the glaciomarine sea. As the moraine passed through wave-base, nearshore deposits were formed on its top surface by reworking of the moraine sediments, and are represented by the upper meter of sand and gravely sand. Photo by Dorothy Tepper.
Last updated on October 6, 2005