Our planet, its past and future; or, Lectures on geology . Pliocene. — Sands, cla}-s,and marls. Miocetu. — Marls, lime-stones, &c. Eocene. — Clays, sand-stones, &c. Cluilk. — Flint, greensand,limestones. Hcnlden. Oiiiile. — Shales and lime-stone. Lias. — Sliales. Trias. — Ked sandstonesand saliterous maris. ^ \ ^ i A s. r y ??-^ QO Q c; o 7—r < s. !0! ?2 ° Magnesiaii limestones and red sandsi .es,shales, and ^lonieraie. o a Olii Red — — —

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Our planet, its past and future; or, Lectures on geology . Pliocene. — Sands, cla}-s,and marls. Miocetu. — Marls, lime-stones, &c. Eocene. — Clays, sand-stones, &c. Cluilk. — Flint, greensand,limestones. Hcnlden. Oiiiile. — Shales and lime-stone. Lias. — Sliales. Trias. — Ked sandstonesand saliterous maris. ^ \ ^ i A s. r y ??-^ QO Q c; o 7—r < s. !0! ?2 ° Magnesiaii limestones and red sandsi .es,shales, and ^lonieraie. o a Olii Red — — — Sandstone. Loiuer Ileldcrberg. Sali/eroiis. — Marls. Niagara. Otuida. Hudson. Trenton Limatou. Potsdam Sandstone. Crystallized limestones,gneiss, and quartzite. Clay-slate, mica-schist,gneiss.

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Keywords: ., bookcentury1800, bookdecade1880, bookidourplanetits, bookyear1881