In New Hampshire, bedrock consists of relatively hard, dense igneous and metamorphic (crystalline) rocks comprised of tightly interlocking mineral grains. pamphlet, īedrock maps classify and describe the different types of rock exposed at the surface or present just below the overlying surficial material. Geological Survey Scientific Investigations Map 3200, 1 sheet, scale 1:24,000, 31-p. Walsh, G.J., Jahns, R.H., and Aleinikoff, J.N., 2013, Bedrock geologic map of the Nashua South quadrangle, Hillsborough County, New Hampshire, and Middlesex County, Massachusetts: U.S. Municipalities interested in exploring the possibility of creating geologic maps to meet special needs, whether for planning or zoning or some other purpose, should contact NHGS. They can serve as indispensable tools for addressing many existing environmental problems and for proper planning to avoid other environmental problems in the future. Geologic maps are an important information resource at the start of any site investigation or infrastructure project. Detailed mapping is generally performed at a scale of 1:24,000, covering individual 7.5-minute U.S. We are committed to producing readily accessible map products in both traditional paper as well as digital formats to meet the our stakeholders’ needs for authoritative geologic information. NHGS competes annually for matching funds from STATEMAP to support mapping projects with the greatest potential to yield societal benefits, as determined by the New Hampshire Geologic Resources Advisory Committee. Today’s NHGS carries on that tradition through its ongoing participation in the federal STATEMAP component of the National Cooperative Geologic Mapping Program. Since the very first New Hampshire Geological Survey (NHGS) was inaugurated in 1839, geologists have been mapping the bedrock, surficial deposits, and mineral resources of the Granite State.
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