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The Pliocene history of northern and central Mississippi
The record of Pliocene time in northern and central Mississippi is generally assumed to be scant or lacking. The published geologic maps of this region show no Pliocene formations, and the only deposit in the region that has been assigned to the Pliocene is the un-mapped so-called Lafayette formation. This formation, however, in recent years has lost some of its good standing, for several students
Authors
E.W. Shaw
The Quaternary geology of southeastern Wisconsin, with a chapter on the older rock formations
No abstract available.
Authors
W. C. Alden
The upper Chitina Valley, Alaska, with a description of the igneous rocks
No abstract available.
Authors
Fred Howard Moffit, Robert Milton Overbeck
Thirty-ninth annual report of the Director of the United States Geological Survey
The appropriations for the work of the United States Geological Survey for the fiscal year 1917-18 comprised items amounting to $1,750,520. The plan of operations as approved by the Secretary of the Interior contemplated surveys and investigations in the United States and Alaska designed mainly to obtain information or to encourage activities essential to the rapid and successful prosecution of th
Authors
George Otis Smith
Topographic instructions of the United States Geological Survey
This book is intended to replace the instructions relating to the topographic work of the United States Geological Survey, issued as a part of the general Survey, instructions of 1903, which are now in many respects obsolete, although revised portions of them have, from time to time, been issued as circular letters or printed leaflets. The several portions of this book were prepared by the members
Authors
Second report of the Hawaiian Volcano Observatory of the Massachusetts Institute of Technology and the Hawaiian Volcano Research Association: On cyclical variations in eruption at Kilauea
This work treats chiefly of observed changes in the height of stand of molten lava in the crater of Kilauea. It also takes account of concurrent variations in the apparent energy of eruptive action at the surface of the magma column. With little doubt these conditions vary in a complex periodic way.To explain these periods in part an hypothesis is advanced which depends upon recurrent astronomical
Authors
Harry O. Wood
A fossil flora from the Frontier formation of southwestern Wyoming
This paper deals with a small but important fossil flora, now known to be of Colorado age, from the vicinity of Cumberland, Lincoln County, Wyo. It was for many years thought to be of Jurassic age, and only within the last decade has its stratigraphic position been established. Although small in number of species, this flora offers information bearing on the physical and climatic conditions that p
Authors
F. H. Knowlton
A reconnaissance of the Archean complex of the Granite Gorge, Grand Canyon, Arizona
The field work upon which this article is based was done in March and April, 1914. From Garnet Canyon, near the west end of the Granite Gorge, the route followed the Tonto trail along the so-called lower plateau, or Tonto platform, to Red Canyon, at the east end of the Granite Gorge.
Authors
L. F. Noble, J. Fred Hunter