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Page 6480, results 161976 - 162000

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Publication Extents

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Metalliferous deposits of the greater Helena mining region, Montana
Joseph Thomas Pardee, F. C. Schrader
1933, Bulletin 842
The ore deposits described in this bulletin are distributed through a region of about 3,000 square miles surrounding the city of Helena, Mont. In general the surface of this region is mountainous, but it includes several large intermontane valleys. Large areas in the northern and eastern parts of the region...
Some of Alpheus Hyatt's unfigured types from the Jurassic of California
C.H. Crickmay
1933, Professional Paper 175-B
Alpheus Hyatt named a considerable number of Jurassic fossils from California. Only a few of these were described, arid none were illustrated. In this paper 16 of these species are evaluated in terms of present-day nomenclature, figures of the type specimens are shown, and their probable age significance is given....