Английская Википедия:Cockeysville Marble

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Шаблон:Short description Шаблон:Infobox rockunit The Cockeysville Marble is a Precambrian, Cambrian, or Ordovician marble formation in Baltimore, Carroll, Harford and Howard Counties, Maryland. It is described as a predominantly metadolomite, calc-schist, and calcite marble, with calc-gneiss and calc-silicate marble being widespread but minor.[1]

Файл:Cockeysville Formation Massive Metadolostone Mbr.jpg
Sample of Massive Metadolostone Member of Cockeysville Marble, from old quarry near Lower Dam of Loch Raven Reservoir, Baltimore County, Maryland

The extent of this formation was originally mapped in 1892[2] within Baltimore County.

Quarrying

The Cockeysville Marble has been quarried in Beaver Dam within Cockeysville and other locations in Maryland. A historical account is given in Maryland Geological Survey Volume Two.[3]

The Cockeysville was also mined for crushed stone at what is now called Quarry Lake.[4] It was known as the McMahon Quarry in the 1940s.

The Cockeysville was mined by Lafarge and by Martin Marietta Inc. at the Marriottsville Quarry, Marrtiottsville, Maryland.

The Washington Monument in Baltimore and the one in Washington, D.C. are constructed from the Cockeysville Marble.

See also

References

Шаблон:Reflist

Партнерские ресурсы
Криптовалюты
Магазины
Хостинг
Разное

  1. ↑ Geologic Map of Maryland, 1968. Cleaves, E. T., Edwards, J. Jr., and Glaser, J. D. Maryland Geological Survey. Scale 1:250,000.
  2. ↑ Ошибка цитирования Неверный тег <ref>; для сносок Williams1892 не указан текст
  3. ↑ Maryland Geological Survey Volume Two, by W. B. Clark, 1898. Johns Hopkins University Press. (Google Books)
  4. ↑ McMahon Quarry (Greensberg Quarry), Bare Hills, Baltimore Co., Maryland, USA
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