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Publication Extents

Not all publications have extents, not all extents are completely accurate
Bedrock topography of central Iowa
R.E. Hansen
1985, IMAP 1609
The bedrock in Iowa (Hershey, 1969) generally is ovelain by deposits of glacial drift and alluvium. The drift, comprised of glacial till and glacial outwash, varies in thickness from less than 1 foot to more than 400 feet; the alluvium in central Iowa varies in thickness from less than 1...
Seismotectonic map of the Puget Sound region, Washington
H. D. Gower, J. C. Yount, R. S. Crosson
1985, IMAP 1613
The Puget Sound region is a seismically active area with hundreds of earthquakes occurring each year (Crosson, 1974, 1975, Crosson and Millard, 1975, Crosson and Noson, 1978a, 1978b, 1979). Most of the earthquakes are so small that they can be detected only by sensitive seismographs such as those operated by...