Well Drillers Near Custer, South Dakota

A geological estimate for the Custer area.

Detailed Summary

Based on well logs from across the Custer area, the most common lithological sequence is an initial unconsolidated or drift cover (often referred to as 'dirt', 'drift', or 'overburden'), generally less than 10-15 feet thick. Beneath this cover lies a sequence of schist, varying in color from gray to brown, often with notable fracturing that enhances water yield. The schist constitutes the main aquifer-bearing formation, typically extending from just beneath the drift down to depths of 120-180 feet or more. Fractured zones within the schist commonly provide the best groundwater yields. Outlier lithologies and thin interbeds (such as minor quartzite or slate) are seldom significant and not included in this representative profile.

Expected Geological Layers