Vermont Geological Survey

• Main Authors: David J. De Simone, Marjorie Gale, Laurence R. Becker
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2009
• Subjects: Buttress; Flood Brook; Green Mountain; Ice Sheet
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.598.1409; http://www.anr.state.vt.us/dec/geo/images/digitalofrs/londonderrysurf/londonderryreport.pdf

The Town of Londonderry is situated in the northwest corner of Windham County within the Green Mountain physiographic province of Vermont. Much of the Town is at elevations between approximately 1000ft and 1500ft. A waning Wisconsinan ice sheet withdrew from the base of Glebe Mountain in the southeast corner of the town. The existing surficial geologic mapping (Stewart and MacClintock 1970) shows ice contact sediment in the valleys throughout the Town. The map units consist of kame terrace and kame moraine sediment and this indicates retreat of an active ice margin from the buttress of Londonderry Mountain. The existing map shows that till predominates in the uplands and that only the narrow valleys contain sorted overburden materials that might serve as aquifers. The West River flows generally southward through the Town. Tributary valleys are oriented along southeast and southwest trends, perhaps related to structural controls in the bedrock. Winhall River and Flood Brook are the primary tributary valleys in the Town.