Geology of Cedar County

Quaternary and Silurian Geology at the Martin Marietta Cedar Rapids Quarry, Linn County, Iowa

Open File Report LXV – Geology of Chippewa County, Michigan - VerWiebe – Page 1 of 33 GEOLOGY OF CHIPPEWA COUNTY MICHIGAN

The earliest comprehensive work on the geological formations in this county was done by Carl Rominger. He published his findings in volume 1 of the Geological Survey of Michigan in 1873. It appears from a careful reading of this report that Rominger visited practically every one of the isolated outcrops on the mainland portion of the county, and a good many of those located on the islands which...

Surficial Geology of the Davenport West and Davenport East 7.5’ Quadrangles, Scott County, Iowa

A CONTRIBUTION TO ECONOMIC GEOLOGY GEOLOGY OF THE CHRISTMAS COPPER MINE GILA COUNTY, ARIZONA By NEJLS P. PETEKSON and EOGER W. SWANSON

The Christmas copper mine is in the Banner mining district, Gila County, Arizona. It is 8 miles north of Winkelman and 22 miles south of Globe. The mine was opened in 1905; to the end of 1943 it had produced about 55,340,000 pounds of copper. In 1946 it was operated under lease. The ore is high-lime fluxing ore, required by the smelter at Hayden. The ore produced during 1942 averaged 2.16 perce...

The Journal of Geology

As magmas rise toward the surface, they traverse regions of the mantle and crust with which they are not in equilibrium; to the extent that time and the intimacy of their physical contact permit, the melts and country rocks will interact chemically. We have modeled aspects of these chemical interactions in terms of ion-exchange processes similar to those operating in simple chromatographic colu...