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View article: Quicksilver deposits of the Bonanza-Nonpareil district, Douglas County, Oregon
Quicksilver deposits of the Bonanza-Nonpareil district, Douglas County, Oregon Open
The Bonanza-Nonpareil quicksilver district of Douglas County, Oreg., occupies a narrow belt, about 8 miles long, trending north-northeast.It lies entirely within the Umpqua formation of Eocene age.Mining began between 1865 and 1870 at both…
View article: Geologic features of the Connecticut Valley, Massachusetts as related to recent floods
Geologic features of the Connecticut Valley, Massachusetts as related to recent floods Open
This report gives the results of a geologic study of certain features that bear upon the recent flood behavior of rivers flowing in the Massachusetts part of the Connecticut Valley. It is in part an outline of the physiographic history of …