upper millstone - определение. Что такое upper millstone
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Что (кто) такое upper millstone - определение

Millstone grit; Millstone Grit Group
  • The Salt Cellar, a gritstone tor on [[Derwent Edge]] in the [[Peak District]], England
  • [[Stanage Edge]] in the eastern Peak district

Millstone Grit         
Millstone Grit is the name given to any of a number of coarse-grained sandstones of Carboniferous age which occur in the British Isles. The name derives from its use in earlier times as a source of millstones for use principally in watermills.
millstone grit         
¦ noun a coarse sandstone of the British Carboniferous, occurring immediately below the coal measures.
Upper school         
IN ENGLAND, SCHOOLS WITHIN SECONDARY EDUCATION; SECTION OF A LARGER SCHOOL
Upper School; Upper schools
Upper schools in the UK are usually schools within secondary education. Outside England, the term normally refers to a section of a larger school.

Википедия

Millstone Grit

Millstone Grit is the name given to any of a number of coarse-grained sandstones of Carboniferous age which occur in the British Isles. The name derives from its use in earlier times as a source of millstones for use principally in watermills. Geologists refer to the whole suite of rocks that encompass the individual limestone beds and the intervening mudstones as the Millstone Grit Group. The term Millstone Grit Series was formerly used to refer to the rocks now included within the Millstone Grit Group together with the underlying Edale Shale Group.

The term gritstone describes any sandstone composed of coarse angular grains, and specifically refers to such sandstones within the Pennines and neighbouring areas of Northern England.