Hensel Paleosol samples underwent X-Ray Fluorescence analyses to determine major element composition. The chemical index of alteration without potash, given by the molar ratio of Al2O3/(Al2O3+CaO+ Na2O)*100, was used to compute mean annual precipitation (MAP) in millimeters using the correlation: MAP = 221×e0.0197(CIA-K) (R2=0.73) . The mean annual precipitation range for the Hensel Paleosol is 222-243 mm/yr.
The Hensel Paleosol data suggest warm, arid conditions existed during the mid-Cretaceous in Central Texas. The warming trend apparent from the Hensel Paleosol section is in agreement with global warming conditions noted from Sea Surface Temperatures during this period. The Late Aptian was a relatively cool and stable period followed by a warming episode which occurs through the Albian. The deep root system and abundance of calcareous nodules is indicative of a dry climate where the roots must go deeper in order to find water. The MAP estimate for the Hensel Paleosol data suggest arid conditions at the Aptian/Albian boundary in Central Texas which corresponds to the arid belt at the paleolatitude at 25°N.
 Nordt, L., S. Atchley, and S. Dworkin, 2003. GSA Today Dec 03, 4-9.  Sheldon, N.D., G.J. Retallack, and S Tanaka, 2002. J. Geol 110, 687-696.