Mapping & Petrography Appendices · appendix-17
Petrography — Sheet 17
The BS micrograph is classified as lithic wacke and reportedly contains quartz, feldspar, sedimentary and volcanic lithic fragments, abundant opaques, chlorite, microquartz matrix, sericite and clay cement.
SOURCE-LED TECHNICAL READING
Geological interpretation and evidential boundary
The BS micrograph is classified as lithic wacke and reportedly contains quartz, feldspar, sedimentary and volcanic lithic fragments, abundant opaques, chlorite, microquartz matrix, sericite and clay cement. Matrix near twelve percent places the sample close enough to a classification threshold that counting uncertainty and cement-versus-matrix distinction matter. Angular to subrounded grains and moderate-to-poor sorting suggest limited textural maturity, compatible with relatively rapid delivery, but do not identify a unique transport process. Provenance interpretation should separate altered volcanic fragments from matrix and verify the unusually high opaque fraction. The plate supports a compositionally immature sandstone whose tectonic and depositional meaning requires replicate samples and facies context.
- Source
- Private geological appendix archive · controlled source record
- Location in source
- Source-linked record
- Image quality
- HD
- Record ID
- appendix-17
