Sundry Geological Problems

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Sundry Geological Problems
G Gudbrand Henriksen
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Similar instances can be had from the hematite deposits in Cumberland, where brachjppodes and corals have been converted into hematite retaining their form. By Konerud- kollen zinc mines near Drammen one finds corals filled with crystals of idocrase. Ore deposits are largely formed by diffusion and migration of igneous emanations of metal- liferous matter having taken place within the sediments adjacent to an eruptive according to laws analogous to those obtaining for the segregation of ores wi
...thin eruptives. Thus effects of pressure play a similar role also for ore deposits in sediments. The sediments have been able to get into a state sufficiently fluid to allow of the migration of metalliferous particles, but not sufficiently fluid to obli- terate all the fossils.
The post-silurian eruptives of the Christiania district, geologically speaking, have their porphyric rim and their border sheeting, in red sandstones as at Krokkleven and Holmestrand or in dark hornblendic slate as at Krekling, Eker.


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