MULTIPLE SEDIMENTARY AXES IMPACT ON THE CHICOT AQUIFER
It appears that from grain-size analysis of about 1500 sieve samples the sands sourced from the Red River are generally finer than those sourced from the Mississippi River. This is indicated by a smaller median grain size determined from sieve test results. In addition, the Red River sands tend to have excess fines more often than Mississippi River sands as indicated by skewness values determined from analysis of sieve test results.
Lastly due to differences of sand thickness, and texture throughout the Chicot the porosity and hydraulic conductivity differ throughout the Chicot. In terms of porosity the Chicot is slightly more porous in areas that are Red River deposits than Mississippi River deposits. This was determined from analysis of about 50 geophysical logs and 1,000 individual points. In addition, hydraulic conductivity of Red River sediments appears to be lower than Mississippi River deposits as determined from a set of about 600 specific-capacity tests analyzed. However, within the Mississippi River deposits the parishes which appear to have more ancestral river channels yield the largest values of hydraulic conductivity.