(and other geologic evidence)

Codes and Abbreviations on Map

H1 - Holocene age of offset determined by radiocarbon (14C) dating

H2 - Modern soil or alluvial unit distinctly offset, or contains features conclusive of shearing, such as gouge, rotated pebbles, transported materials in shear zone, and filled fissures over distinct Pleistocene faults

H? - Inconclusive signs of Holocene offset, such as steps in base of soil or apparent shears inclay-rich materials. Without corroboration such evidence neither proves nor disproves either existence or age of faulting

H - Active trace reported in trench, trench logs not in public file

HP - Distinct faulting in unconsolidated alluvium of possibly Holocene or more likelylatest Pleistocene age

F? - Feature shown as fault in log resembles nontectonic feature such as bedrock–alluvial contact, buried terrace riser, or landslide plane

NF - No fault observed

P - Distinct evidence of significant faulting in Pliocene or Pleistocene sediments

RC - Roadcut log

WB - Ground water barrier

U - Age of faulting unobtainable because surficial deposits removed ___________________________________________________________

REFERENCE CODES (see also Abbreviated Map References and text for full references.)

C200 - Trench log or creep evidence in non-Alquist-Priolo consultant's report filed at CGS.

    ABBREVIATED MAP REFERENCES

(PDF file of abbreviated references)

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           Comments to Jim Lienkaemper (jlienk@usgs.gov)

                         (Last updated 6 Mar 2006