On the Tertiary Deposits on the Solimões and Javary Rivers, in Brazil

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Abstract
Whilst engaged on the Geological Commission of the Amazon Steam Navigation Company of London, in the year 1874, I had an opportunity of examining some beds on the banks of the Solimões, or Upper Amazon, and one of its tributaries, the Javary, which contained similar species of fresh- and brackish-water shells to those found in the Tertiary beds at Pebas, still further up the Amazon. These, I naturally concluded, were part of a southerly extension of the same deposit; and my conclusion is, I think, borne out by the facts. Thinking that any additional records of this highly interesting Tertiary deposit might prove acceptable to geologists, I have embodied the scanty results of my investigations in the present paper. Amongst the fossils I collected were some hitherto undescribed genera and species, which have now been examined by Mr. Etheridge, who has described them in an Appendix which he has done me the honour to attach to this paper.

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