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- 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
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