A collection of papers which report on the geologic investigations in Alaska. It represents the broad range of U.S. Geologic Survey research activities carried out in Alaska.

The following report analyzes the geological features of a 6-km by 0.3-km strip of glacially polished rocks of the Nelchina River Gabbronorite located in the eastern part of the Anchorage quadrangle.

The following report documents results taken from a reconnaissance geochemical survey that was conducted in the northwest-trending Alexander terrane, Gravina-Nutzotin overlap assemblage, and Taku terrane in southeast Alaska in the Craig and Dixon Entrance quadrangles and the western edges of the Ketchikan and Prince Rupert quadrangles.

The following report follows a geochemical survey and its findings in the Valdez quadrangle in south-central Alaska.

A report about metamorphic rocks exposed near Juneau, Alaska. The belt they are in had a complex history of deformation, metamorphism, and plutonism.

This report covers the study of thermal maturity of sedimentary basins in Alaska taken place in the early 1990s.

A report which provides an overview of eruptions from Mount Spurr and the Alaska Volcano Observatory's response to them.

A report about benthic foraminiferal faunas in 18 borholes from the eastern Beaufort Sea shelf.

Abstract: Researchers at the U.S. Bureau of Mines conducted field investigations at the Greens Creek Mine in southeast Alaska for the purpose of validating computer design of mining methods and assessing real-time monitoring capabilities. The field study required the application of new technology because of the remoteness of the study site, the need for timely acquisition of data, and a limited budget for instruments and data acquisition. Various sensors were installed to monitor rock mass deformation and strain, temperature, SO gas emissions, and blasting. Data were collected through a distributed personal computer network and high-speed modems. These readings were used to develop visualization models of underground metal mining operations and drift-and-fill mining and real-time graphics displays of ground conditions. Results of the field tests showed that it is possible to gather, process, visualize, and verify mine designs on a real-time basis.

Summary of the birds of the Kilbuck and Ahklun Mountain region, including geographical distribution, population status, migration habits, nesting habitat, and zoogeography.

A report that describes the geologic history of various landscapes viewed from major roadways in and around Wrangell-St. Elias National Park and Preserve.

A report about late triassic bivalves of the genus monotis. So far, 14 kinds of Monotis that differ in species or subspecies level can be recognized from Alaska.

From introduction: This report focuses on the placer geology of individual creeks; mining, history of the area, high terrace gravels, and the gold source of the Fortymile River area in Alaska.