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!

Wadsworth Falls


721 Wadsworth St, Middletown, CT 06457

Wadsworth Falls State Park Connecticut State Park 285 acres in Middlefield and Middletown, CT Parking: Main park entrance at 770 Wadsworth St. Read more…

Mamacoke Island


41.391195, -72.099637

Mamcoke Island Connecticut State College Arboretum Park 40.5 acres in Waterford, CT Parking: Small pull off near 44 Benham Ave Quaker Hill, CT Trail Map      … Read more…

Day Pond State Park


41.557409, -72.418005

Day Pond State Park / Salmon River State Forest / Comstock Covered Bridge Connecticut State Park and State Forest 180 acres in Colchester, CT Parking: Day Pond… Read more…

Sleeping Giant


200 Mt Carmel Ave, Hamden, CT, USA

Sleeping Giant State Park Connecticut State Park 1,465 acres in Hamden, CT Parking: Main Lot: Large lot at 200 Mt Carmel Ave, Hamden, CT   East End: Small… Read more…

Diana’s Pool


20 Dianas Pool Rd, Chaplin, CT, USA

Diana’s Pool State Designated Water Access 15 acres in Chaplin, CT Parking: Small lot at 20 Dianas Pool Rd Chaplin, CT Trail Map       Trails: Less than… Read more…