A Contribution to the Geology of the Pre Cambrian Igneous Rocks of the Fox River
A Contribution to the Geology of the Pre Cambrian Igneous Rocks of the Fox River
Samuel Weidman
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Like the pheno- crysts these fragments are flattened in the plane of the cleavage, although their parallel arrangement in this plane is not so com- plete as that of the phenocrysts. This incomplete orientation is especially true of some of the larger fragments. The fragments have been subjected to as much deformation as the normal rock, and evidence x the fact that they were present in the rhyolite be- fore the mashing process began. They are scattered promiscu- ously through the formation, and... are not associated with any zone of faulting nor with any foreign rock. While the evidence of the extrusive origin of this rock is not conclusive, yet from its analogy with the other rhyolite outcrops, and from the evidence of the fragments, the Berlin rock is believed to be a surface rock like the other rhyolite outcrops of the region. While deformation of the rhyolite is chiefly that of mashing, there was a concomitant development of a system of fractures -and joints. The deformation is in the zone of combined flowage and fracture, as defined by Prof.
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