A1R1G2I1L1L1I1T1E1S1
11 points
ARGILLITES is validvalid
ARGILLITE, a metamorphic rock, intermediate between shale and slate, that does not possess true slaty cleavage
ARGILLITE, an indurated clay rock
ARGILLITE, a metamorphic rock, intermediate between shale and slate, that does not possess true slaty cleavage
ARGILLITE, an indurated clay rock