= greywacke, n.
| 单词 | θ5378 |
| 释义 | the world > the earth > structure of the earth > age or period > stratigraphic units > [noun] > primary or Palaeozoic > Silurian > specific (7) grauwacke1794 = greywacke, n. greywacke1805 Originally: any of a series of coarse-grained, earthy sandstones and shales forming extensive deposits in the Harz Mountains and other parts of… Wenlock formation1834 a formation of Upper Silurian age, typically developed near Wenlock. In modern use, the name of the middle of three divisions of the Silurian, lying… Trenton1854 A name given (attributive, or elliptical as n.) to a limestone formation exemplified at Trenton Falls, and hence to the group or series of Lower… obolite grit1859 Only in obolite grit, a sandstone formation containing fossil brachiopods of the genus Obolus. Salina1863 Used attributively and absol. to designate a group of sub-stages of the upper Silurian in New York State and adjacent areas, characterized by… Downtonian1900 Chiefly with the. The Downtonian stage; the series of rocks dating from this time. |
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