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Sedimentologic and paleontologic analyses of a 10.5 m subsurface section from the Estancia Valley provides a high-resolution paleolimnologic record of a pre-late Wisconsin section that is suspected to represent early through middle Wisconsin time. Relative abundances of ostracodes, foraminifers, Ruppia, and charophytes, along with sedimentologic aspects, depict a time interval characterized by alternating dry and wet playas and shallow saline lakes. The saline lakes exhibit marked evolution from brackish to saline to, presumably, hypersaline conditions. The overall paleoenvironmental conditions are in great contrast to those represented by the overlying full glacio-pluvial sediments of late Wisconsin age.

The pre-late Wisconsin section,...

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