Geology of Connecticut



  • 1842 James Gates Percival – Report on the Geology of Connecticut
    • In 8 months surveyed the state East to West at 4 mile intervals. The resurveyed again East to West at intervals between the former to bring him in contact with each of the 4600 square miles of the state.
    • He collected estimated 8000 specimens, as well as noted dips, bearings, and formations making it likely the most accurate survey ever conducted of the state
    • However, despite two years of survey and he was “rushed” by the state legislature and wrote a “hasty outline” of over 500 pages
  • 1906 Manual of the Geology of Connecticut and Preliminary Geological Map by William North Rice and Herbert Ernest Gregory
  • 1924 H. H. Robinson – State Geological and Natural History Survey
  • 1977 The Connecticut Assembly names Garnet the state mineral
  • 1985 John Rodgers (compiler) Bedrock Geological Map of Connecticut

Geological Reports of Parks

This page is a work in progress if you’re interested in more information, shoot me an email (see bottom of the page) and let me know how this page could be of better use to you!

Dinosaur State Park


400 West St, Rocky Hill, CT 06067

Dinosaur State Park Connecticut State Park 80 acres in Rocky Hill, CT Parking: Large lot at 400 West St, Rocky Hill, CT Trail Map         … Read more…

Brainerd Quarry Preserve


41.488694, -72.505217

Brainerd Quarry Preserve Middlesex Land Trust 50 acres in Haddam, CT Parking: Shoulder parking near 213 Injun Hollow Rd East Hampton, CT Trail Map The northern trailhead didn’t… Read more…

Mount Tom State Park


41.692952, -73.273396

Mount Tom State Park Connecticut State Park 231 acres in Litchfield, Morris, and Washington, CT Parking: Large lot near 27 Mt Tom Rd, New Preston, CT Trail Map   … Read more…

Gay City State Park


386 North St, Hebron, CT 06248

Gay City State Park Connecticut State Park 1,569 acres in Hebron, CT Parking: Large lot at 386 North St Hebron, CT year round with additional parking open… Read more…