There are many ways in which surface geology can be useful to geophysics, not only as an aid to structural interpretation, but in refining the accuracy and improving the efficiency of geophysical methods. That the vast majority of geophysical work has been accomplished in relative ignorance of the surface geology is an established fact. Many specific examples of misinterpretation and waste can be attributed to a lack of consideration of surface geology. Because of this historical lack of surface geologic consideration, there is a large reservoir of data which can be high-graded and refined very inexpensively. Photogeology is by far the most rapid, effective and inexpensive way to do surface geology.

Possibly the geophysical tool most critically affected by the surface geology is gravity. From Newton's First Inverse-Square Law it follows that density changes closest to the gravimeter, affect it most critically. Four practical ways in which gravity data can be refined by coordination with photogeology are cited, along with slides to demonstrate the problems. Inexpensive coordination procedures are described. In many areas they represent an easy improvement and an effective prospecting program.

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