Photograph as originally submitted to this page in the Historical Marker Database www.HMdb.org. Click on photo to resize in browser. Scroll down to see metadata.

Photographer: Barry Swackhamer
Taken: August 10, 2020
Caption: Painted by the Past Marker
Additional Description: Captions: (bottom row, left to right) Iron red paleosol indicate a warm and moist environment where the soil was usually damp. Ponds and lakes would have dotted the area. Rainfall would have been at least 31 inches (800mm) per year, and may have been as high as 53 inches (1350mm) per year.; The yellow and tan soils indicated a drier environment than the red, where standing water would not have been present in much of the area. Rainfall would have been between 23 inches (600mm) and 47 inches (1200mm) per year. Today's rainfall averages 12 inches.; The black spots in some areas are caused by manganese concentrations. These are thought to be indicators of some sort of plant that fixed manganese in the soil, much the same way that the Kenyan toothpick tree (Dobera glabra) does today.
Submitted: October 17, 2020, by Barry Swackhamer of Brentwood, California.
Database Locator Identification Number: p544170
File Size: 0.852 Megabytes

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