Chronostratigraphy of the Corriental reservoir. (A) Soil horizons and sediments of the Corriental reservoir showing the location of anthropogenic quartz and radiocarbon ages yr B.P. (B) Relative percent of zeolite by depth. (C) Distinctive mineral XRD peaks. (D) Photomicrograph of anthropogenic euhedral quartz crystals and zeolite. Kenneth Barnett Tankersley used Microsoft PowerPoint for Mac Version 16.41 (www.microsoft.com) to create this figure.