ABSTRACT
I SHALL enter into no further details respecting the component members of each group of stratified rocks, than are represented by the lines of division and colours upon the section. * They are arranged under the old divisions of primary, transition, secondary, and tertiary series, more from a sense of the convenience of this long received arrangement, than from the reality of any strongly defined boundaries by which the strata, on the confines of each series, are separated from one another.
