Abstract
ABSTRACT Lacustrine sediments from six pluvial lake basins on the southern High Plains, Texas contain illite, montmorillonite, interstratified illite-montmorillonite, kaolinite, glauconitic mica, and in two basins, sepiolite. Sepiolite, illite-montmorillonite, and glauconitic mica are authigenic; some of the montmorillonite is derived from volcanic ash, but most of the lacustrine clay is detrital and representative of ancient soils of the Llano Estacado. Increase in kaolinite and montmorillonite with depth and corresponding decrease in illite is indicative of a Pleistocene pluvial period antedating Tahoka Clay time (14,000 to 22,000 years B. P.). Lacustrine strata of post-Tahoka age, formed in a closed lake environment, consist of illite, illite-montmorillonite, montmorillonite, sepiolite with gypsum, sodium sulfate, glauconitic mica, and dolomite.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
