File:Cecil county (1902) (14589716937).jpg

Identifier: cecilcounty00mary (find matches)
Title: Cecil county
Year: 1902 (1900s)
Authors: Maryland Geological Survey Shattuck, George Burbank, 1869- Bascom, F. (Florence), 1862-1945 Mathews, Edward Bennett, b. 1869 Dorsey, Clarence Wilbur, 1876- Bonsteel, Jay A. (Jay Allan), 1873- Fassig, Oliver Lanard, 1860-1936 Pressey, Henry Albert, 1873- Bauer, L. A. (Louis Agricola), 1865-1932 Curran, Hugh M Sudworth, George Bishop, 1862- Geological Survey (U.S.) United States. Bureau of Soils
Subjects: Geology
Publisher: Baltimore, The Johns Hopkins press
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
FIG. 3.-GILPIN ROCKS (mETA-RHYOLITE), NEAR BAY VIEW.
Text Appearing After Image:
FIG. 2.— FALLS OVER GILPIN ROCKS, NEAR HAY VIEW, VIEWS OF PIEDMONT PLATEAU. MARYLAND GEOLOGICAL SURVEY 137 hornblende rapidly increases in amount upon the periphery of thedike and in all altered material. The quartz-feldspar mosaic seems to be an original feature and notdue to the complete crushing of the constituent of an originallycoai se-grained rock, as premised by Dr. Grimsley. A proof of this lies in the presence of uncrushed phenocrysts, some-times with sharp crystal boundaries, which possess inclusions of thefine mosaic of the groundmass. Quartz constitutes a considerable proportion of the rock; not farfrom forty per cent when the rock is fresh. Feldspar is somewhat less in amount. It is rarely twinned andis without crystal boundaries. As a constituent of the groundmass,it is too fine-grained for determination. So far as the small, imper-fect and scattering phenocrysts admitted of determination, orthoclase,albite and an acid oligoclase are the species represented. Biotiteocc

Note About Images