In this paper, the results of the stratigraphical and geo-stractural surveies, geo-chemical observations, and geophysical prospects by gravity, magnetic, seismic and electric methods in the northern part of Akita Prefecture known as the so-called Hokuroku Kurokô Area are described.
As the results of the above-mentioned observations, the lateral and vertical changes in lithofacies of the sedimentary and igneous rocks, their relations, and the stratigraphic positions of the Kurokô are deposits were established and particularly that the geo-structure and the igneous activity of the Tertiary strata, and the forming-place of the Kurokô are were intimately related with the pre-Tertiary basement structures was recognized.
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