The Dardanelles area studied includes both the Gallipoli peninsula (Turkey) and land across the straits, altogether an area about 25 miles wide by 50 miles from north to south. The oldest rocks are marbles and schists that are intruded by a pre-Tertiary granite and serpentinite, and are unconformably overlain by Tertiary volcanic and sedimentary rocks. The Dardanelles is a drowned fault valley.

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