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Geological > Geology of Long Island Sound
Figure 3:  160,000,000 - 30,000,0000 Years Ago
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A View of Connecticut and a Portion of the Atlantic Coastal Plain in Mid-Cretaceous Time, About 100,000,000 Years Ago

From the time that the Atlantic Ocean opened, sediments of Triassic through Lower Cretaceous age were being eroded from interior New England and Connecticut, transported southward, and deposited on the continental margin. This early deposition filled in most of the bedrock basins and irregularities that existed along the continental margin south of Connecticut, and was the first step in the creation of Long Island. A bedrock ridge that extended seaward from the Branford, Connecticut area would later emerge as a drainage divide, as the Long Island Sound basin was forming. The dashed green outline shows the approximate position of present day Connecticut.

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