Water Supply and Irrigation Papers of the United States Geological Survey (1900) (14803323193)

Identifier: watersupplyirrig3437unit (find matches)
Title: Water Supply and Irrigation Papers of the United States Geological Survey
Year: 1900 (1900s)
Authors: United States Geological Survey
Subjects:
Publisher:
Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and 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:
Note: Figures denote depths of borings MAP OF A PORTION 01 if without + signquartzitewasmet withatthatdepth Showing d Ail depth areas estimated averagesThequartzitesurface has many local irregularities by: I 200 - 300 WATER-SUPPLY PAPER N° 34 PL. IV
Text Appearing After Image:
STERN SOUTH DAKOTAj to bed rock )D 1899 J LIU US BIEN B CO. LITH N. 500-600 600-700 S00-900 900-1000 1000-110(1 roDD.) GENERAL GEOLOGY. 15 COLORADO FORMATION. This includes two series of deposits, which were first separated byDr. F. Y. Hayden. The lower series, composed mostly of shale andclay, was named Benton, from its great development near Fort Benton,Montana, and the upper series, composed largely of chalkstone, wascalled Niobrara. These two subdivisions, though usually differing con-siderably in lithologic character, are often grouped together becauseof the similarity of the fossils which appear in them. Moreover, theline between them is not easily established, because in many places thechalk grades into the clay and shale; and even when fairly pure,enough protoxide of iron is present to give it a bluish tint resemblingthe shale. It has been found very difficult to separate them in thisarea by means of the reports of well-borers. One well-borer will saythat within a given region

Note About Images

Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.