Page:A Treatise on Geology, volume 2.djvu/75

 CHAP. VI. of St. Austle and St. Blazy, is described by Mr. P. Rashleigh (Geol. Trans. of Cornwall, vol. ii. p. 281.) as occupying a vale, which has received drifts from the sea, as well as from the country above. The series of beds is thus noticed:—

At Mount's Bay (Dr. Boase, in Trans. Geol. Soc. Cornwall), the vegetable deposit is covered, on the sea coast, by a thick bed of shingles, and inland, appears beneath a marsh. Elytra of insects appear in this deposit, very little changed from their pristine beauty.

De Luc paid great attention to peat deposits and buried forests in all situations. In his observations on Holland he makes frequent mention of the low level of the peat and silt deposits, attributing this circumstance to a subsidence of those materials in the course of their desiccation. From M. Van Swinden he learned that there were lakes in Friesland, which had once been woods. "Le Fljuessen Meer, par exemple, grand lac