Note 64 — Chapter VI · LIFE AT MANAOS.—VOYAGE FROM MANAOS TO TABATINGA.
Reading edition
In the course of the investigation, I have ascertained that this slaty rock, as well as the hard sandstone seen along the river-banks at Manaos, forms part of the great drift formation of the Amazons, and that there is neither old red sandstone, nor trias, here, as older observers supposed.—L. A.