VALDIVIA: ISLAND OF MOCHA.
The formations of Chiloe seem to extend with nearly the same character to Valdivia, and for some leagues northward of it: the underlying rocks are micaceous schists, and are covered up with sandstone and other sedimentary beds, including, as I was assured, in many places layers of lignite. I did not land on Mocha (latitude 38 degrees 20 minutes), but Mr. Stokes brought me specimens of the grey, fine-grained, slightly calcareous sandstone, precisely like that of Huafo, containing lignite and numerous Turritellae. The island is flat topped, 1,240 feet in height, and appears like an outlier of the sedimentary beds on the mainland. The few shells collected consist of:—
1. Turritella Chilensis, G.B. Sowerby (also at Huafo). 2. Fusus, very imperfect, somewhat resembling F. subreflexus of Navidad, but probably different. 3. Venus, fragments of.