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USGS provides a digital geologic map database for the Romoland 7.5' quadrangle in Riverside County, California. The dataset includes ARC/INFO coverages, a Postscript plot file with a topographic base, and PDF documentation. Map units are identified by formationname, age, and lithology, with grain size indicated by subscripted letters.
Map scale in PDF files is influenced by Adobe Acrobat page size settings. The dataset uses compound symbols (e.g., Qyf2sc) and multiple subscripted letters for mixed units, requiring specific parsing logic.