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OCR for page 99
THE UNITED STATES GEOLOGICAL SURVEY 99
In the matter of mineral resources, a series of broad, comprehensive
reports by resources has been undertaken covering coal, oil and gas, oil
shales, cannel coal, lead and zinc, iron, feldspar, glass sand, molding
sand, limestone, slate and building stones. Studies are being continued
on these, on clay arid clay products, on sand and gravel, and on other
mineral resources.
The ground water studies of northwestern, southwestern, southeastern
and northeastern corners of the State have been covered, and well "agings
are being read all over the State to determine the relation of water-table
to rainfall.
Fundamental scientific studies have been made on a number of geologic
problems, including the physiographic history, and especially the glacial
history of the Susquehanna and eastern Pennsylvania, on the stratigraphy
of the Silurian and Devonian systems, and on other minor studies.
PRESENT MAIN LINES OF WORE
The Survey is at present undertaking one new county report, is con-
tinuing work on several quadrangles to be included in Atlas reports, and
this year it is completing work which has been in progress over a number
of years on oil and gas, limestone, slate, and a number of Atlas quad-
rangles, with a view to publication during this biennium so far as funds
will permit.
PREVIOUS SURVEY ORGANIZATIONS
This is the :Fourth Survey of Pennsylvania. The First Survey, under
H. B. Rogers, was started in 1836, lapsed in 1842, and then in 1851 was
revived long enough to prepare two large volumes in 1858. The Second
Geological Survey, under J. P. Lesley, was organized in 1874 and con
tinued to 1887, with some additional time for the preparation of a fou~*-
volume Summary Report completed in 1895. In 1899 a Topographic and
Geologic Survey Commission was provided for, under which topographic
and geologic work was done by the United States Geological Survey in
cooperation with the Commission. In 1908 a State Survey was estab-
lished and R. R. Oice appointed State Geologist. Cooperative geologic
work ceased, though cooperative topographic mapping continued. This
Survey failed to receive adequate support and in 1919 it was replaced by
the present Survey.
RHODE ISLAND
No information was furbished.
Representative terms from entire chapter:
geological survey
