|Norbeck Intrusive Suite|
Stratigraphic range: Ordovician
|Primary||tonalite, metadiorite, metagabbro|
|Region||Piedmont of Maryland|
|Named for||Norbeck, Maryland|
|Named by||C. A. Hopson, 1964|
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, and is shown as such on the Geologic Map of Maryland of 1968. A. A. Drake later revised the name after more detailed mapping. It intrudes through the Wissahickon Formation.