Bachelor Mountain Quadrangle Geologic Map and Database

A digital geologic map database of the Bachelor Mountain 7.5' quadrangle in Riverside County, California, includes ARC/INFO coverages, a Postscript plot file, and PDF documentation. The map identifies units by formation name, age, and lithology, with grain size indicated by subscripted letters. The data was compiled by the USGS but has not been edited to comply with full I-map series standards.

Use Cases

• Analyze spatial distribution of geologic units based on formation name and lithology attributes.
• Study relationships between sediment age (e.g., Qyf) and grain size classifications (e.g., a for arenaceous, s for silt).
• Create derivative maps by querying map unit symbols that indicate mixed compositions, such as Qfysa for silty sand deposits.
• Correlate map units using the provided Correlation of Map Units (CMU) and Description of Map Units (DMU) diagrams.

Strengths

• Map units are identified by standard geologic criteria including formation name, age, and lithology.
• Includes a Correlation of Map Units diagram and Description of Map Units in USGS editorial format.
• Contains multiple data formats: ARC/INFO coverages, Postscript plot files, and PDF documentation.

Limitations

• Test plots of the PDF files have not produced precise 1:24,000-scale map sheets.
• The Correlation of Map Units and Description of Map Units has not been edited to comply with full USGS I-map standards.
• Specific row counts, column details, and temporal coverage for the data are not provided.

Provenance

Source

U.S. Geological Survey (USGS), as indicated by the summary.

Collection Method

Digital compilation and geologic mapping, resulting in ARC/INFO coverages and associated graphic files.

Geography

Bachelor Mountain 7.5' quadrangle, Riverside County, California, USA.