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the results. The studies have been done at scales of 1:1,000,000 and 
1:5,000,000. Figures 3 and 4 show the preliminary results of the inter- 
pretation at 1:5,000,000 scale and show only the major and most certain 
features thus far interpreted. There appears to be a close relationship 
between both the curvilinear and linear features and the occurrences of 
minerals, petroleum, and geothermal sources. Several large "energy" 
companies are known to be devoting significant effort to the use of this 
information, especially curvilinear features, in geothermal investiga- 
tions. It is also interesting to note that one of the major lineaments 
extends from northern Florida and intersects other linears extending 
southeast from New England and south from Lake Michigan, in the vicinity 
of New Madrid, Missouri, the site of the most severe earthquake to take 
place on the North American Continent in modern times. The point of 
intersection of the linears is also proximate to the Missouri lead/zinc 
district. 
Saunders and others (1973) have complete structural studies of: 
1) Areas of the major Laramide mineral deposit, 2) the Williston-Blood 
Creek basin, 3) the Colorado mineral belt, 4) the uranium areas of 
Utah and Colorado, and 5) other mineralized and petroliferous regions 
of North America. They have concluded that there is a great advantage 
in photogeologic interpretation from the satellite viewpoint to provide 
a truly synoptic examination of regional geologic features; lineaments 
and other geomorphic features with dimensions of tens to hundreds of 
kilometres which are not generally detected on aerial photographs. They 
also found that the use of Landsat imagery for regional scale structural 
studies is about 1/500th as expensive as using conventional aerial 
photography. They have noted that close empirical relationships between 
lineaments and curvilinear tonal or drainage anomalies occur between 
both mineral deposits and the structure of sedimentary basins. 
Bolivian efforts under the leadership of Dr. Carlos Brockmann are 
among the most advanced, if not the most advanced, in Latin America. In 
a cooperative experiment, W.D. Carter of the USGS and Brockmann have 
produced a Landsat mosaic of the La Paz area and mapped a large number 
of structural features, and compared them geographically with known 
minerals and oil information, to arrive at a set of exploration 
priorities. Carter reported (written communication, 1974), "The high- 
light of the week was to learn that the Mineral Resources Division of 
Geobol is using the interpretation of the La Paz mosaic as a guide to 
exploration for new mineral deposits. One geologist had just brought 
in a large rock sample of mineralized fault breccia containing copper 
oxides and sulfides from a linear feature, 20 km in length in the 
Corocoro Copper Mining District." 
In Alaska, landform analysis of Landsat-1 images, substantiated by 
geophysical data, persuaded Fischer and Lathram (1973) to propose a new 
area for petroleum exploration. As seen on the images, lakes in the 
Arctic Coastal plain are dominantly elongate, having their long axes 
parallel to each other, trending about N. 9° W. Northwest of the Umiat