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Photograph illustrating the variability of glacier-dammed lakes: Blockade Lake in the process of refilling. This lake in the Chigmit Mountains is impounded behind a massive ice dam 15.2 km (9.5 miles) in length formed where Blockade Glacier laterally enters a deep, narrow valley at the far end of the lake. Although the major flow of ice is to the eastern terminus, a portion of the ice flows toward the lake terminating in an ice cliff from which large icebergs are discharged. This lake does not dump annually but large changes in surface level indicate that the ice dam fails every few years causing major floods on McArthur River. Kenai quadrangle, Spurr district, Cook Inlet region, Alaska, cc 1970. Published on sheet...
Categories: Image;
Tags: Blockade Glacier,
Glaciers,
Photographers,
Post, A. Collection,
Spurr district, Cook Inlet region, Alaska,
The Tyonek area in the northwestern Cook Inlet trough is rich in petroleum, coal, geothermal, aggregate, and timber resources, but the detailed geologic mapping necessary for planning future resource development exists only in part of the area. This report and geologic map provide basic surficial-geologic information useful for exploiting those resources and planning future utility corridor developments. In addition to mapping of surficial geologic units, we provide discussion of strategraphic evidence pertaining to physiographic relations and geologic history of volcaniclastic deposits derived from ancestral Mount Spurr, multiple phases of Quaternary glacial activity, Chakachatna River valley landslide complexes...
Aerial view of Blockade Glacier. Spurr district, Cook Inlet region, Alaska, n.d.
Categories: Image;
Tags: Blockade Glacier,
Glaciers,
Photographers,
Post, A. Collection,
Spurr district, Cook Inlet region, Alaska,
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