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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Mudstone 5 letters:

SHALE: Mudstone
SHALE: Mudstone, e.g.
MUDSTONES: Rocks made of clay
MUDSTONE: Rock that's easily eroded
MUDSTONE: Relative of 85 Across.