Pleistocene%20Terrace%20Deposits%20in%20Estero%20San%20Antonio

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Pleistocene Terrace Deposits in Estero San
Antonio

• Two interpretations of 1 valley
• by
• Robert Davies

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Location Map
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Work completed by

• Hitchcock, C.S., Kelson, K.I., 1998, Assessment
  of Seismogenic Sources between the Rodgers Creek
  and San Andreas Faults, Northwestern San
  Francisco Bay Region, Sonoma County, California
• Helley, E. J., Lajoie, K. R., Spangle, W. E,
  Blair, M. L., 1979, Flatland deposits of the San
  Francisco Bay Region, Californiatheir geology
  and engineering properties, and their importance
  to comprehensive planning

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Hitchcock and Kelson
Qt2
Qt4
Qt3
Qt4
Qt3
Qt3
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Helley et al.
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Time scale
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Comparison of dates
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Fossil age Ranges
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Problems in the maps

• Formations mapped differently
• units have different ages based on the same
  fossils!