Wikisource

Page:A Treatise on Geology, volume 1.djvu/191

This page has been validated.
CHAP. VI.
PALÆOZOIC STRATA.
175
Retrieved from "https://en.wikisource.org/w/index.php?title=Page:A_Treatise_on_Geology,_volume_1.djvu/191&oldid=7592806"