Norbeck Intrusive Suite
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Norbeck Intrusive Suite
Norbeck Intrusive Suite
Stratigraphic range: Ordovician
Primarytonalite, metadiorite, metagabbro
RegionPiedmont of Maryland
ExtentMontgomery County
Type section
Named forNorbeck, Maryland
Named byC. A. Hopson, 1964[1]

The Norbeck Intrusive Suite is an Ordovician granitic pluton in Montgomery County, Maryland. The intrusive suite was originally mapped as the Norbeck Quartz Diorite by Hopson,[1] and is shown as such on the Geologic Map of Maryland of 1968. A. A. Drake later revised the name after more detailed mapping.[2] It intrudes through the Wissahickon Formation.


Three lithologies were mapped in the Kensington quadrangle by Drake:[2]


  1. ^ a b Hopson, C.A., 1964, The crystalline rocks of Howard and Montgomery Counties: Maryland Geological Survey County Report, 337 p., (Reprinted from Cloos, Ernst, and others, "Geology of Howard and Montgomery Counties," p. 27-215)
  2. ^ a b Drake, A.A., Jr., 1998, Geologic map of the Kensington quadrangle, Montgomery County, Maryland: U.S. Geological Survey Geologic Quadrangle Map, GQ-1774, scale 1:24,000

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