Results 111 to 120 of about 46,008 (233)

The Geologic Features of the Occurrence of Copper in North America [PDF]

open access: yes, 1933
Copper is of such widespread natural occurrence in North America and there are so few metal-mining districts that have not contributed to its production that it is obviously necessary in any brief general treatment of the geology of the copper deposits ...
Ransome, F. L.
core  

Microscopic study of “siliceous rocks” of Sarbay formation in Mednogorsky ore district (South Ural)

open access: yesRUDN Journal of Engineering Research, 2014
The article shows the results of microscopic study of siliceous rocks Early Silurian Sarbay formation of the Southern Urals. Siliceous rocks Early Silurian Sarbay formation of the Southern Urals have a voulcanische genesis.
V V Diakonov   +3 more
doaj  

Crinoids from the Silurian of Western Ohio and Indiana [PDF]

open access: yes, 2013
A large section of the stratigraphic column of the Great Lakes Area is composed of carbonate rock from the Silurian Period (ca. 443-419 Ma). This limestone, which has been highly dolomitized, formed in association with an ancient reef system that was ...
Myers, Jeremy
core  

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