Riverside County, California is covered by a digital geologic map database of the Perris 7.5' quadrangle. The data package includes ARC/INFO coverages and map units identified by formation name, age, and lithology, with grain size indicated by subscripted letters. The summary was provided by the USGS.
Use Cases
- Conduct geologic hazard assessment based on formation and lithology data.
- Analyze Quaternary alluvial fan deposits based on unit symbols indicating grain size (e.g., Qyfa).
- Perform regional geologic correlation based on the provided Correlation of Map Units.
- Map subsurface resources based on identified lithologic units.
Strengths
- Map units are identified by standard geologic criteria: formation name, age, and lithology.
- Grain size is indicated for known units using a specific subscripted letter system (e.g., lg, b, g, a, s, c).
- Includes a Correlation of Map Units and Description of Map Units in USGS editorial format.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
- Last update date is unknown; freshness unverified.
Provenance
- Source
- USGS (United States Geological Survey)
- Collection Method
- Digital geologic mapping, compiled into ARC/INFO coverages.
- Time Range
- null
- Freshness
- null
- Geography
- Perris 7.5' quadrangle, Riverside County, California, USA