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Updated: May 26, 2025
The vast thickness of these beds, in some instances, is what attests the profoundness of the primeval oceans in which they were formed; the Pensylvanian grawacke, a member of the next highest series, is not less than a hundred miles in direct thickness.
Rocks: 1. Gneiss and Mica Slate system Foetal: 1st month, that of an avertebrated animal; Clay Slate and Grawacke system Foetal: 1st month, that of an avertebrated animal; Silurian system Foetal: 1st month, that of an avertebrated animal; Silurian system Foetal: 1st month, that of an avertebrated animal; Silurian system Foetal: 1st month, that of an avertebrated animal;
It has also been stated, that the gneiss and mica tract of Bohemia contains some seams of grawacke, in which are organic remains; but British geologists have not as yet attached much importance to this statement. We have to look a little higher in the series for indubitable traces of organic life.
Above the gneiss and mica slate system, or group of strata, is the Clay Slate and Grawacke Slate System; that is to say, it is higher in the ORDER OF SUPRAPOSITION, though very often it rests immediately on the primitive granite. If we overlook the dubious statements respecting Sutherland and Bohemia, we have in this "system" the first appearances of life upon our planet.
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