Report Upon the Condition and Progress of the U.S. National Museum During the Year Ending June 30 Volume 2. United States National Museum
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 Excerpt: ... The Montello rock is very fine grained, compact, and of a dull pink color. Quarries were first opened here to furnish paving stones for the Chicago market, but the stone has since been used to a considerable extent for general building and monumental work. According to Prof. T. C. Chambcrlaint the great Lanrentian area of the northern part of the State is occupied largely by granite and gneiss, among which are some of exceptional excellence. Granite rocks of greater or less excellence crop out along the upper reaches and tributaries of the Menominee, the Peslitigo, the Oconto, the Wrolf, the Wisconsin, the Yellow, the Black, the Chippewa, the Flambeau, the Bad, and the Montreal Rivers. These are now being brought within the reach of cheap transportation, and should be utilized to the mutual benefit oCthose who work and those who use. Report Tenth C'ousus, Vol. X, p. 27d, t Geology of Wiscousin, Vol. J, p. 66. F.--THE PORPHYKIES, POEPHYRITIC FELSITE. (1) COMPOSITION AND ORIGIN. Popularly any fine-grained, compact rock, carrying larger crystals scattered throughout its mass is called a porphyry, whatever may be its composition. In the present work the term has been restricted to those acid eruptive rocks of pre-Tertiary origin, consisting of a very compact felsitic base formed of an intimate mixture of quartz and feldspar and in which one or both of these minerals are porphyritically developed. The groundmass is usually too line to allow a determination of its composition by the unaided eye, and under the microscope is found to possess that peculiar felt-like structure called by lithologists microfelsitic. The porphyritic crystals arc usually of a different color from the groundmass in which they are imbedded, and hence produce the striking effect which has ...
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