Mapping & Petrography Appendices · appendix-09
Petrography — Sheet 09
The BG thin-section plate records a matrix-supported carbonate assigned to wackestone, with reported microspar, spar, skeletal grains, pisoids and minor quartz.
SOURCE-LED TECHNICAL READING
Geological interpretation and evidential boundary
The BG thin-section plate records a matrix-supported carbonate assigned to wackestone, with reported microspar, spar, skeletal grains, pisoids and minor quartz. The classification is plausible if allochems exceed ten percent while lime mud remains load bearing, but the stated 5–15 mm grain size at 40× is almost certainly a unit or calibration error and must be corrected. Modal percentages should identify counting method and sum, while recrystallised microspar should not be mistaken for primary depositional mud. The fabric supports a relatively low-energy carbonate setting or protected microenvironment; it does not demonstrate reef framework. Diagenetic replacement, cementation and transported grains should be separated from primary microfacies before depositional interpretation.
- Source
- Private geological appendix archive · controlled source record
- Location in source
- Source-linked record
- Image quality
- HD
- Record ID
- appendix-09
