M3A1R1L1S1T1O1N1E1
11 points
MARLSTONE is validvalid
mudstone that is rich in lime
a sandy calcareous stratum, containing, or impregnated with, iron, and lying between the upper and lower Lias of England
mudstone that is rich in lime
a sandy calcareous stratum, containing, or impregnated with, iron, and lying between the upper and lower Lias of England