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Geological > Geology of Long Island Sound
Figure 8:  15,500 - 5,000 Years Ago
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A View of Connecticut and Long Island as the Long Island Sound Estuary was Forming, About 9,000 Radiocarbon Years Ago

The system of stream channels that developed as glacial Lake Connecticut drained away became the avenue for the sea to enter the Long Island Sound basin around 15,000 radiocarbon years ago. The rising sea transgressed through the Block Island Sound basin and entered the Long Island Sound basin through the spillway notch at the Race. It then spread westward along the channel system. By about 9,000 years ago the sea had overwhelmed the channels, and Long Island Sound was beginning to attain its present configuration. Tides and currents had developed and were beginning to remove glacial material from the constricted eastern Sound, redistributing it in wider, lower energy areas west of the Connecticut River.

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