Friday, July 12, 2013
Regolith and Quarternary Sedimentology: questions to infer paleogeomorphology and paleoclimate
Surface geology maps of the area offer confusing clues to interpreting these buried layers. The geological map for the quandrangle to the North of San Lorenzo Springs (the Silver Creek quandrangle) shows paleochannel flows on the surface, as well as relictual dunes from some point in the Quarternary. Why are the paleochannel flows going every which way? Was this whole valley a closed basin, and if so, would that explain the aggradation, independent of sediment supply? Why is this stream downcutting so rapidly today? What are the implications for the future?