A Monograph of the Trilobites of North America 6x2k40
by Jacob Green 6f4l6y
A Monograph of the Trilobites of North America PDF edition and other Jacob Green books available for free from our library. u2s6u
Some geologists imagine that the order of creation is ed in the rocks which compose the external crust of the earth, and that they can there clearly read a progressive development of organic life; in other words, that a succession of more perfect animals may be traced in ascending from the lower strata to the upper or more recent formations; that there is a gradual approach to the present system of things, and a succession of destructions and creations; worlds of living beings alternating with worlds of desolation and death, antecedent to the existence of man.
