Guilford Quartz Monzonite
Quartz monzonite pluton in Howard County, Maryland / From Wikipedia, the free encyclopedia
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The Guilford Quartz Monzonite is a Silurian or Ordovician quartz monzonite pluton in Howard County, Maryland. It is described as a biotite-muscovite-quartz monzonite which occurs as discontinuous lenticular bodies[2] which intrude mainly through the Wissahickon Formation (gneiss).
Quick Facts Type, Lithology ...
Guilford Quartz Monzonite | |
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Stratigraphic range: Silurian | |
Type | igneous |
Lithology | |
Primary | monzonite |
Location | |
Region | Piedmont of Maryland |
Extent | central Maryland |
Type section | |
Named by | Cloos and Broedel, 1940[1] |
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The extent of this intrusion was originally mapped in 1940[1] as the "Guilford granite". It was given its current name in 1964 by C. A. Hopson.[3] Hopson grouped the Guilford Quartz Monzonite with the Ellicott City Granodiorite and the Woodstock Quartz Monzonite as "Late-kinematic intrusive masses."