A lithostratigraphic unit is defined by the lithological properties of the surrounding rock, as opposed to fossil content.
Notes on verification
Standard geological definition confirmed by multiple authoritative sources including the International Commission on Stratigraphy's official guide, encyclopedic references, and academic course materials. [cascade flags: aggregator_dropped_primary_exists | tier=silver indep_score=0.875 clusters=2 claim_tier=everyday]
Sources
- Biozone (wikipedia)
- https://www.geol.umd.edu/~tholtz/G102/lectures/102lith.html (corroboration)
- https://stratigraphy.org/guide/litho (corroboration)