Geological Mapping · mapping-4-13
Parallel-laminated sandstone beds used as turbidite evidence
The exposed sandstone beds show parallel lamination and grain-size or weathering contrasts compatible with tractional reworking within a gravity-flow deposit.
SOURCE-LED TECHNICAL READING
Geological interpretation and evidential boundary
The exposed sandstone beds show parallel lamination and grain-size or weathering contrasts compatible with tractional reworking within a gravity-flow deposit. Assignment to a specific Bouma division requires sedimentary structures to be visible at the correct scale: planar lamination supports Tb, whereas ripple cross-lamination is needed for Tc, and massive or normally graded bases are required for Ta. Bed bases, tops, sole marks, grading direction, thickness and lateral continuity should be logged before a complete turbidite sequence is inferred. The photographs therefore support process-level evidence for episodic sediment gravity flow, while the precise facies code remains conditional. Regional comparison with the documented Halang longitudinal turbidite system provides context, not a substitute for local sedimentary logging.
- Source
- Private mapping source vault · geological evidence record
- Location in source
- PDF page 66
- Image quality
- Source scan
- Record ID
- mapping-4-13
