Combined description of map units and correlation of map units for the Petersburg-Wrangell area 1:63,360-scale geologic maps, southeastern Alaska

Reconnaissance geologic map of the Petersburg D-4 quadrangle, southeastern Alaska

“…This map is one of a series that share the same format and general information (Brew, 1997a-m;Brew and Koch, 1997). There are both a combined description and a combined correlation of the map units for this whole series of maps (Brew and Grybeck, 1997).…”

Reconnaissance geologic map of the Petersburg A-3 quadrangle, southeastern Alaska

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The geologic information presented here has been released previously in generalized form at 1:250,000 scale (Brew and others, 1984); that map is based on reconnaissance field mapping and therefore the individual maps in this series of 1:63,360-scale maps (Brew, 1997a-m;Brew and Koch, 1997) do not have the density of field-station control, samples, or field observations that are expected in published U.S.Geological Survey 1:63,360-scale geologic maps. There are both a combined description and a combined correlation of the map units for this whole series of maps (Brew and Grybeck, 1997).The available information on known mineral deposits in the whole Petersburg/Wrangell area was released previously (Grybeck and others, 1984) and Brew and others (1989, 1991). Bedrock, stream-sediment, and other geochemical data were released and interpreted by Karl and others (1985), Karl and Koch (1990), Cathrall and others (1983a-w), and Tripp and Cathrall (1984.

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“…Geological Survey 1:63,360-scale geologic maps. There are both a combined description and a combined correlation of the map units for this whole series of maps (Brew and Grybeck, 1997).…”