2192. Impure limestone, resting on top of Cumberland shales, Bottom stratum. From below the mill dam on Muddy creek. A granular limest- one, somewhat cellu- lar, cut showing some petroleum which gives it a brownish color. It weathers ochrous. 2193. Impure limestone, Nia- gara, Top stratum, 8 in. thick. From below the mill dam on Muddy creek. Elliston. An impure granular limestone; somewhat cellular, dark brownish- grey, somewhat mottled, contains petroleum the infiltration of which gave the dark color to the rock. Weathers fer- ruginous. 2194. Impure limestone. Second from top. From just below mill dam on Muddy creek. Elliston. Resembles preceding. But is darker colored. Contains petroleum & some iron pyrites. 2195. Impure limestone, Niagara, Third stratum from top. From below mill dam on Muddy creek. Elliston. Resembles preceding. Rather finer grained and harder, contains petroleum. Exterior surface weathers ferru- ginous. 2196. Impure limestone, Clinton group? From the quarry north of Rogersville, a compact a fine granular rock, semi- fossiliferous, of an olive grey color, in some parts brownish. Con- tains some iron pyrites. 2197. Limestone from below the Canda-gallo grit at the gap of the Canferus limestone. a fine granular, brow- nish grey rock, gives the odor of petroleum when heated, and probably con- tains this mineral.