Geologic map of Connecticut bedrock. Shows shaded terranes, fault lines, and Mesozoic formations. Shows shaded terranes, fault lines, and Mesozoic formations. Created 1990 by Connecticut Geological & natural History Survey By the time Lewis and Clark arrived on the West Coast in 1805, it had been 105 years since the Cascadia Subduction Zone last ruptured, sending a large portion of the Pacific Ocean roaring toward the coast. Connecticut Geologic Map See map details From geology.about.com Created 1990 Three Wesleyan University scientists have discovered that a fault line that passes through Connecticut and was long thought to be dormant is active and producing periodic earthquakes. Connecticut's Eastern border fault was created, a fault which begins in New Haven and stretches 130 miles up to Keene, New Hampshire. The fault is currently inac… Another is the Cameron's Line Fault which divides the [Proto-North America.] As a result, the land west of this fault was downset, creating a rift valleyand causing the land to tilt an average of 15 to 25 degrees. Plainfield is not far from an ancient fault called the Lake Char-Honey Hill line that formed when the Pangea supercontinent was assembled about 400 million years ago. Many tribes even left the region permanently.

2014-11-20 07:18:32 UTC 1.7 magnitude, 2 km depth Byram, Connecticut, United States 1.7 magnitude earthquake 2014-11-20 07:18:32 UTC at 07:18 November 20, 2014 UTC However, it wasn’t until the discovery of the Cascadia Fault in the 1960s th… In July, a 1.6 magnitude earthquake was … An online map of United States Quaternary faults (faults that have been active in the last 1.6 million years) is available via the Quaternary Fault and Fold Database. The few remaining Native Americans in the area spoke of the earth shaking and ocean rising to consume the land. Northwest Highlands from the rest of the Western Uplands [Iapetos Ocean Mud]. One of the most important faults in Connecticut is the Eastern Border Fault, which is where the central valley tilted. While we are not exactly living atop a fault line, Connecticut residents are no strangers to seismic bumps — and worse — in the night. There is an interactive map application to view the faults online and a separate database search function. Geologic map of Connecticut bedrock. KML (Google Earth-type) files and GIS shape files are also available for download from the site. About 200 million years after this collision and the formation of Pangea, during the middle of the Mesozoic Era, the Atlantic Ocean floor started spreading and great extensional forces were experienced, resulting in faulting.

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