Abstract:suitable for most exploration work within the basin. Changes in relative sea level in the study area are probably the result of an interplay of eustacy and tectonism. Regionally variable changes in climate had an important effect on shaping the character of the sediments.
The Black Hills is an asymmetric uplift about 210 km (130 mi) north-south and 100 km (60 mi) east-west. It is cored by Precambrian age metamorphic rocks that are
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