Dakota Aquifer Program--Geologic Framework
Regionalized Classification and its Application to
the Dakota Aquifer, Hodgeman County, Kansas
by Ricardo A. Olea and Geoffrey C. Bohling
Original published as KGS Open-file Report 96-22, June 1996.
Regionalized classification is a numerical technique for the
partition of a portion of the planet into volumes that are as
internally homogeneous as possible and as different as possible
from each other. The method works at its best when there are
measurements of the same attributes at all control points evenly
scattered around the area of interest.
Application of the procedure employing four cumulative thickness
measurements in 231 wells in south-central Hodgeman county leads
to the following findings concerning the heterogeneity of the amount
of shale in the Dakota aquifer:
All findings are in agreement with previous general notions about
the geology of the aquifer in Hodgeman county in particular and the
state in general.
- Delineation of thick basal sand deposits in the Dakota Formation
suggest sedimentation along fluvial system draining the area to the
- A thicker than normal and elongated accumulation of sand suggests the existence of a WNW channel during Cheyenne time.
- Most favorable deposition of sands in mid-Dakota Formation was erratic and concentrated in the flanks of flood plains.
- There is an extensive northwest-southeast band where deposition of sands was never favorable.
- Continuous favorable condition throughout the entire genesis of the Dakota aquifer is haphazard and sporadic.
Table of Contents
Allocation by Extension
The Dakota Aquifer Program Study
Well clustering by the Ward's method
Mapping of group membership probabilities
Regionalized classification maps
Appendix--Dakota aquifer sampling used in the regionalized classification
Dakota Home ||
Geologic Framework Index
Kansas Geological Survey, Dakota Aquifer Program
Updated Sept. 16, 1996.
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