This volume presents the history of the state's geology and the method behind mapping its rocks beneath the surface. It blends narrative history with field-scale classifications, showing how ancient processes shaped the land we see today.

The work frames a long history—from early crustal growth and metamorphism to the Triassic eruptions that carved the landscape. It also explains how glacial activity shaped surface features and how the map represents formations buried beneath modern cover. Readers will encounter a catalog of rock types and their origins, including igneous, sedimentary, and metamorphic rocks that form Connecticut’s crystalline core and surrounding layers.

Encounter a wide range of rock types, from granite-gneiss and diorite to quartz schist and phyllite.
See how intrusion, metamorphism, and faulting altered original rocks over deep time.
Learn how Triassic volcanism and glacial history contributed to the present topography.
Understand the basis for the geological map’s depiction of subsurface formations.

Ideal for readers of natural history and state geology, especially those interested in Connecticut’s geologic map and its rock catalog.

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