Basinal deposits, undifferentiated
Basinal deposits, undifferentiated
Quaternary
Basinal deposits; fine-grained alluvium occurring mainly in low-relief lower elevations of the Central Valley bordering the southwestern range margin, and sparsely in higher elevation valleys along the eastern range boundary. Unconsolidated or minimally consolidated, poorly stratified, silt, clay, and fine sand deposited by still or slow-moving water in low-relief floodplains, overbank environments, and other similar environments. Age unconstrained within Pleistocene.