Value of epeirogenic curves in interpreting spatial distribution of the geomagnetic field

Use of electronic computers has made possible a wider and at the same time more detailed interpretation of magnetic anomalies. It also permits the making of three dimensional computations and interpretations, which were practically prohibited with older methods. The present paper is a detailed magnetic and structural study of the east flank of the Urals from the extreme south beyond Chelkar, through Magnitogorsk, to a latitude just north of Sverdlovsk. A complex history of fault formation and development is worked out and presented on a map of the block structure (fig. 3) and two series of "epeirogenic curves" (fig. 4). It is pointed out that these curves can also be useful in a study of the origin of mineral deposits in the area.--E. Ingerson.