Bulletin of the Geological Society of America

Cover Bulletin of the Geological Society of America
Bulletin of the Geological Society of America
Geological Society of America
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12, 1887, vol. X, p. 81.
LV II— Bull. Gkol. Soc. Am., Vol. 1, 1889.
Digitized by Google .436 J. S. DILLER — SANDSTONE DIKES.
quake are Tvell known. It is interesting to note that the saud brought up to the surface at that time was, in some cases at least and perhaps in many, decidedly micaceous, even more so than that in the saudstoue dikes.
Of the mineral particles usually found in sand the scales of mica are most easily transported by water. This fact is sometimes made use of in petro- graphi
...c laboratories to separate mica from other minerals in rock powders by causing water to flow up through the rock powder, regulating the current so that it will carry up the mica and allow it to escape above through an outlet, while the other portion of the powder remains behind. The tendency of this sort of action in filling earthquake fissures would be to render the sands brought up to the surface more micaceous than those which remain^ behind.
The formation of a system of parallel fissures by earthquakes and filling them with sand forced up from below is a common phenomenon, and in all essential features apparently identical with the formation of the sandstone dikes described in this paper.


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