The Geology of the St. Johnsbury Quadrangle, Vermont and New Hampshire

This resource is available as a downloadable file, ESRI Service, and as a Web Feature service. Resource includes a Bedrock map, Lineations map, Tectonic map, Quarry map, Cross Section, and a text for Bedrock geology for the Geology of the St. Johnsbury quadrangle, Vermont and New Hampshire. For more information see links provided. Abstract: Metamorphosed sedimentary and volcanic rocks of Ordovieian, Silurian and/or Devonian age underlie the St. Johnsbury quadrangle. The Ordovician rocks are part of the New Flampshire sequence and have been assigned to two formations, the Albee and Ammonoosue. The Albee formation consists of 4,000 feet of slate, quartz-mica schist, micaceous quartzite, and quartzite. The Ammonoosnc volcanics are chiefly metamorphosed soda rhyolite tuffs and flows, with some black slate and quartz-mica schist.

Data and Resources

Metadata Source

Additional Info

Field Value
Citation Date 1959-01-01T12:00:00

Harvest Information

Original ID ba2f0b9d21f71acfe10609f76e102e5f
Index Date 2017-08-30T16:18:09Z
Original Format ISO-USGIN
Original Version 1.2

Author

Name Hall, L. M.
Position missing
Organization Vermont Geological Survey
Email marjorie.gale@state.vt.us

Geographic Extent

North Bound 44.5
South Bound 44.25
East Bound -72
West Bound -72.25