A magnetic anomaly near Bear Lake, Houghton County, Michigan
Open-File Report
52-169
By: James C. Wright
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Abstract
A large magnetic anomaly of unknown origin occurs about 1 1/2 miles east of Bear Lake, Houghton County, Michigan, in secs. 24 and 258 T. 56 N., R. 34 W. The occurrence is isolated in an area of very weakly magnetic rocks and has special geologic interest because it is adjacent to a non-magnetic rhyolite porphyry body that is stratigraphically higher than any other known igneous rock in the Keweenawan series.
An aeromagnetic survey of the Michigan copper district by the Geophysics Branch of the U. S. Geological Survey in 1948 first revealed the anomaly (Fig. 1). The anomalous area has been more fully outlined by a dip-needle survey, and briefly discusses the geology of the area and possible significance of the anomaly.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | A magnetic anomaly near Bear Lake, Houghton County, Michigan |
| Series title | Open-File Report |
| Series number | 52-169 |
| DOI | 10.3133/ofr52169 |
| Year Published | 1952 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 7 p. |
| Country | United States |
| State | Michigan |
| County | Houghton County |
| Other Geospatial | Bear Lake |
| Google Analytic Metrics | Metrics page |