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1958 Map of Porphyry Reef, 1959 Print
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1958 Map of Porphyry Reef

USGS Topo · Published 1959

About this map

The Continental Divide serves as the primary spine of this high-country survey, marking the boundary between Flathead National Forest and Lewis and Clark National Forest. The landscape is dominated by dramatic geological features, specifically the north-south trending limestone outcrops of Porphyry Reef and the sharply defined Washboard Reef. These ridges dictate the drainage patterns of major mountain waterways, including the North Fork Sun River and the South Fork Sun River.

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Map Details

Date Portrayed1958
Date Published1959
PublisherU.S. Geological Survey
Map TypeTopographic
Scale1:24,000
Physical Dimensions22 x 26.7 inches

Editions of this 1958 Porphyry Reef Map

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Source Details

SourceU.S. Geological Survey
CopyrightPublic Domain