NOTE: This file contains transcribers notes to accompany the original file (hf_g1.ReadMe).

This data is a conversion product and should not serve as the primary source for the complete geologic information for this area. To obtain complete information, please go to https://pubs.usgs.gov/of/1995/of95-597/.  This information may be found as referenced below:

Publisher:	U.S. Geological Survey	
Title:		Geologic map of the Hayward fault zone, Contra Costa, Alameda, and Santa Clara Counties, California: a digital database
Author:		Graymer, R.W., Jones, D.L., and Brabb, E.E.
Original NGMDB identifier: 19449


Purpose: This file set is intended to make outdated Arc/INFO coverages available as open-format shapefiles. No modification to files has been made. Projection was not changed. 

Process: Coverages converted to shapefile using the ArcMap command “Feature Class to Shapefile”. Related tables were preserved by opening in ArcMap and exporting to txt.   

Coverages convert to (descriptions extracted from hf_g1.ReadMe):
	hfcc_um (Geologic map of the Hayward fault zone in Contra Costra County) =
		hfcc_um_arc.shp
		hfcc_um_poly.shp
		hfcc_um.lut.txt
	hfal_um (Geologic map of the Hayward fault zone in Alameda County) =
		hfal_um_arc.shp
		hfal_um_poly.shp
		hfal_um.lut.txt
	hfsc_um (Geologic map of the Hayward fault zone in Santa Clara County) =
		hfsc_um_arc.shp
		hfsc_um_poly.shp
		hfsc_um.lut.txt
	hf_um-flt (Map of faults in the Hayward fault zone with additional database items containing fault name (if any) and fault subzone (see hfgeo.txt for explanation of subzones)) =
		hf_um_flt_arc.shp
		hf_um-flt.lut.txt


Original files included:
	hf_g1.ReadMe	Readme
	hfgeo.txt	A text only computer file containing detailed
			unit descriptions and geological information, 
			plus sources of data and references cited.

	hfdb.txt	A text only computer file containing database
			specifics.

	hfkey.un	Together, these key files produce a
	hfkey.ln	plottable or displayable map explaination
			and key.


Modified: 21 February, 2024 by Karen Morgan, USGS contractor 
