Excerpt from Geological Manual
When it is attempted, as in works of the following description, to sketch the actual state of a particular science, and at the same time to point out a few of the conclusions that may be hazarded from known facts, an author has always great difficulty in avoiding unnecessary and tedious detail on the one hand; while, on the other, he must notice such a number of facts as may convince a student, that he is not wandering in a wilderness of crude hypotheses or unsupported assumptions.
By some it will be considered that too much space has been allotted to lists of organic remains in the following pages. Considerable attention has certainly been paid to such catalogues, as the zoological character of certain rocks is now the subject of much research, and as the result of such investigations may be knowledge of some of the principal conditions under which the fossiliferous rocks were produced: moreover, the author considered that, for practical purposes, there was no alternative between rendering them as perfect as his means of information would permit, or of omitting them altogether.
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