Information om | Engelska ordet GRAYWACKE

Greywacke or graywacke (German grauwacke, signifying a grey, earthy rock) is a variety of sandstone generally characterized by its hardness (6–7 on Mohs scale), dark color, and poorly sorted angular grains of quartz, feldspar, and small rock fragments or sand-size lithic fragments set in a compact, clay-fine matrix.
The primary rock types of the Marin Headlands include graywacke sandstone, radiolarian chert, serpentinite, pillow basalts, and shale.
They consist of metamorphosed graywacke, argillite, tuff, mafic igneous extrusive flows, and carbonate rock.
Apart from intrusions of Ramberg granite, which rose to the surface and solidified 300 million years ago in the Upper Carboniferous Period, and their associated veins of quartz, the ravine of the Bode also cuts through hornfels and knotenschiefer (a type of slate), as well as argillite and graywacke with quartz elements and diabase dikes from the Devonian Period, 400 to 370 million years ago.
Some of the basaltic lava flows are amygdaloidal and some are brecciated along with the interbedded graywacke in shear zones.

Förberedelsen av sidan tog: 5 058,33 ms.

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