From WebRef.orgJump to navigationJump to search
- Lower boundary of zone of concentric folding.
Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- A plane perpendicular to the c, or principal, axis in a tetragonal or hexagonal structure. ASM, 1
- Syn: basal pinacoid
Source: Dictionary of Mining, Mineral, and Related Terms