APPENDIX

Containing some general observations on the Strata in Derbyshire, with Sections of them, representing their Arrangement, Affinities, and the Mutations they have suffered, at different Periods of Time.

This Appendix is intended, not only as an illustration of the preceding inquiries, but also as a specimen of Subterraneous Geography, a science of much importance to mankind, and not merely speculative, being applicable to the purposes of human life; for by knowing the arrangement and affinities of the strata, we are enabled to investigate, with much certainty, whether coal or limestone are contained in the lower regions of the earth; such is the general conformity of these things, so far as my observations have yet been extended. I would not be understood that the strata in every other part of the world are perfectly analogous to those in Derbyshire; or that their productions are the same: but that there is as much regularity in the