This slim volume is a report on the latest scientific research on the geology of the Amazon basin. Written by Richard Rathbun, a noted geologist and paleontologist of the late nineteenth century, it focuses on the work of O. A. Derby, a Brazilian naturalist who conducted groundbreaking fieldwork in the region. The report includes detailed descriptions of the geological formations and fossil beds studied by Derby, as well as his theories on the history and development of the region. A fascinating glimpse into a pivotal moment in the history of South American science.

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