Potsdam Sandstone

Potsdam Sandstone
Stratigraphic range: Latest Guzhangian–Furongian[1][2] PreꞒ Ꞓ O S D C P T J K Pg N
Old Snell Hall at Clarkson University was built with Potsdam Sandstone.[3]
Type	Geological formation
Sub-units	Cairnside Formation, Nepean Formation (Upper Cambrian) Covey Hill Formation (?Middle Cambrian)[4][5] Mount Simon Sandstone[6]
Area	Eastern North America
Lithology
Primary	Orthoquartzite
Other	Conglomerates, local siltstone lenses[7]

The Potsdam Sandstone, more formally known as the Potsdam Group, is a geologic unit of mid-to-late Cambrian age found in Northern New York and northern Vermont and Quebec and Ontario. A well-cemented sandstone of nearly pure quartz, in the 19th century it was widely used in construction and in refractory linings for iron furnaces.^[8]