Database for the bedrock geologic map of the Woodstock quadrangle, Grafton County, New Hampshire

Dates

Publication Date: 2024-06-13

Citation

Walsh, G.J., Burton, W.C., Armstrong, T.R., and Crider, E.A., Jr., 2024, Database for the bedrock geologic map of the Woodstock quadrangle, Grafton County, New Hampshire: U.S. Geological Survey data release, https://doi.org/10.5066/P96TJ9OI.

Summary

The bedrock geologic map database of the Woodstock quadrangle consists of highly deformed metasedimentary rocks of the Central Maine trough, including the Silurian Rangeley and Perry Mountain Formations and the Devonian Littleton Formation. The central, northern, and eastern parts of the quadrangle are underlain by the oldest rocks in the area, the Rangeley Formation. In the southwest and southcentral part of the quadrangle, metaturbidites of the Perry Mountain Formation and subsequent Littleton Formation overly the Rangeley Formation in a deformed F1 synform, herein informally called the Bagley Brook basin. The metasedimentary rocks were intruded by widespread syn- to post-tectonic granitoids of the Devonian New Hampshire Plutonic [...]

Summary

The bedrock geologic map database of the Woodstock quadrangle consists of highly deformed metasedimentary rocks of the Central Maine trough, including the Silurian Rangeley and Perry Mountain Formations and the Devonian Littleton Formation. The central, northern, and eastern parts of the quadrangle are underlain by the oldest rocks in the area, the Rangeley Formation. In the southwest and southcentral part of the quadrangle, metaturbidites of the Perry Mountain Formation and subsequent Littleton Formation overly the Rangeley Formation in a deformed F1 synform, herein informally called the Bagley Brook basin. The metasedimentary rocks were intruded by widespread syn- to post-tectonic granitoids of the Devonian New Hampshire Plutonic Suite and minor post-metamorphic Jurassic-Cretaceous mafic dikes of the White Mountain Plutonic-Volcanic Suite. The metasedimentary rocks were affected by at least two episodes of deformation in the Devonian Acadian orogeny. The dominant regional foliation is second-generation (S2/D2) and formed during the development of sillimanite-muscovite mineral assemblages. Large bodies of the Early Devonian Kinsman Granodiorite intruded the metasedimentary rocks semi-concordantly during D2 deformation. Dikes of Late Devonian Concord Granite cut the Kinsman Granodiorite and the metasedimentary rocks and were emplaced either syn- or post-D2. The map pattern in the Rangeley Formation is dominated by northeast to northwest trending, moderately to steeply north-dipping F2 and F3 folds. Map-scale F1 folds are defined by the Bagley Brook basin. Previous division of Rangeley Formation stratigraphy in this region into “upper” and “lower” parts was not corroborated by 1:24,000-scale mapping of lithodemic units, and rocks previously mapped as part of the Smalls Falls and Madrid Formations are here reassigned to the Rangeley Formation. Some rocks previously mapped as the lower part of the Littleton Formation are now assigned to the Perry Mountain Formation. The Littleton Formation on this map is approximately equivalent to rocks previously mapped as the upper part of the same formation. Steeply dipping fractures in the quadrangle show a preferred northeast orientation, consistent with subsurface fracture orientations in the well fields near Mirror Lake. Jurassic-Cretaceous mafic dikes and normal faults show preferred northeast orientations, similar to the fractures, suggesting that the extensional stress field that controlled dike orientation during the Mesozoic also produced the dominant brittle fabrics in the area.

Contacts

Originator :: Gregory J Walsh, William C Burton, Thomas R. Armstrong, Ernest A Crider
Metadata Contact :: Ernest A Crider
Process Contact :: Ernest A Crider
Publisher :: U.S. Geological Survey
SDC Data Owner :: Florence Bascom Geoscience Center
USGS Mission Area :: Core Science Systems
Distributor :: U.S. Geological Survey - ScienceBase

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WoodstockNHSIM3522-Metadata.xml “Metadata” Original FGDC Metadata	View	34.79 KB	application/fgdc+xml
WoodstockNHSim3522-BaseMap.zip “Base Map Material”		5.42 MB	application/zip
WoodstockNHSIM3522-Hillshade.zip “Hillshade”		102.23 MB	application/zip
WoodstockNHSIM3522-Metadata.zip “Metadata for individual feature classes”		132.18 KB	application/zip
WoodstockNHSIM3522-OpenAccess.zip “Open-Access version”		2.23 MB	application/zip
WoodstockNHSIM3522-Validation.zip “Database Validation”		378.46 KB	application/zip
WoodstockNHSIM3522.gdb.zip “Database and Stylesheet for ArcGIS Pro”		9.84 MB	application/zip

Related External Resources

Type: Related Primary Publication

Walsh, G.J., Burton, W.C., Armstrong, T.R., and Crider, E.A., Jr., 2024, Bedrock Geologic Map of Woodstock Quadrangle, Grafton County, New Hampshire: U.S. Geological Survey Scientific Investigations Map 3522, Scale 1:24,000, 1 sheet, 20-p. pamphlet.	https://doi.org/10.3133/sim3522

Purpose

The geologic map database of the 7.5-minute Woodstock quadrangle is intended to serve as a foundation for applying geologic information to problems involving land use decisions, groundwater availability and quality, earth resources such as natural aggregate for construction, assessment of natural hazards (earthquakes), and engineering and environmental studies for waste disposal sites and construction projects.

Database for the bedrock geologic map of the Woodstock quadrangle, Grafton County, New Hampshire

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