Volume estimates by use of contours find their application in many fields. A practical method of computing volumes by use of contours which the author believes of value to geologists is presented here. It is not original, and is one of many such mathematical approaches, but it has a simplicity particularly suited for stratigraphic and economic estimates of masses. It has not appeared in geological journals, and the writer believes that geologists will find it useful in many situations. An example of this method of estimating volumes from contours is given, in terms of ascertaining the "cut" and "fill" necessary to grade a given area, 500ft. by 700 ft., for a 1% slope, N to S. A contour interval of 1 ft. is used, and the map scale is 1 in. to 100 ft.

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