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The Upper Triassic rocks of Connecticut occupy part of a fault trough that was kept filled as it subsided by deposition of strata consisting of sediment derived from the uplifted block at the eastern margin of the basin, and by extrusion of lava that solidified on the basin floor to make sheets of basalt of uniform thickness and widespread distribution. The Triassic strata have been tilted toward the east and folded and faulted during complex structural activities that occurred after the Triassic and prior to Late Cretaceous time.

Upper Triassic sedimentary strata of central and southern Connecticut consist of two...

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