|
| period = Cambrian | image = SnellHall(2009).jpg | caption = Old Snell Hall at Clarkson University was built with Potsdam Sandstone.〔(A Short History of Potsdam Sandstone ), Potsdam Public Museum website, accessed July 29, 2011〕 | type = Geological formation | prilithology = Orthoquartzite | otherlithology = Conglomerates, local siltsone lenses | unitof = | subunits = *Cairnside Formation, Nepean Formation (Upper Cambrian) *Covey Hill Formation (?Middle Cambrian) *Mount Simon Sandstone | underlies = | overlies = | area = Western North America }} 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.〔James Carl, (Potsdam Sandstone: Composition and Qualities ), Potsdam Public Museum website, accessed July 29, 2011〕 ==Name and type locality== The Potsdam Sandstone is named for its type locality in Potsdam, New York, where in 1838 Ebenezer Emmons described it in outcrops along the Raquette River.〔(Geologic Unit: Potsdam ), U.S. Geological Survey Geolex Database, accessed August 1, 2011〕〔James Carl, (Potsdam Sandstone: Bedrock Geology ), Potsdam Public Museum website, accessed July 29, 2011〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Potsdam Sandstone」の詳細全文を読む スポンサード リンク
|