Among the specimens collected by Mr. Blatchley, as also by Mr. Clayton, Mr. Melville Attwood, and Dr. C. L. Anderson, and now at our office, there is a considerable number which demonstrate the existence of an extensive fresh-water Tertiary deposit in Nevada. This formation, which belongs to a very late Tertiary epoch, evidently occupies a considerable area, as our specimens come from localities hundreds of miles distant from each other. The existence of any marine formation more recent than the Jurassic, in Nevada, has not yet been proved; but, as Mr. Gabb obtained evidence, in 1864, of the occurrence of rocks of Cretaceous age on Crooked River, in Oregon, east of the Cascade Range, it is possible that this member of the series may yet be discovered in Nevada.
All the fossils referred to in this and my previous communication on the geology of Nevada, will receive, in due time, thorough investigation at the hands of Messrs. Meek and Gabb, or other competent palæontologists; and we expect that our collections from that State will be largely increased during the present year.
The death of the eminent naturalist, Dr. A. A. Gould, of Boston, was announced by Dr. Gibbons.
Regular Meeting, December 3d, 1866.
President in the chair.
Nineteen members present.
Donations to the Library:
Sechster Bericht des Offenbacher Vereins für Naturkunde, 8vo., 1865. Jahrbuch der k. k. geologischen Reichsanstalt, xvi Band, No. 1., 8vo., Wien, 1866. Monatsbericht der königlichen Preussischen Akademie der Wissenschaften zu Berlin, Jan.-Mai, 1866, 5 parts, 8vo., Berlin, 1866. Acta Universitatis Lundensis, 1864, 2 parts, 4to., Lund. 1864-5. Transactions of the Connecticut Academy of Arts and Sciences, Vol. 1, Part 1, 8vo., New Haven, 1866. Memoirs of the Boston Society of Natural History, 4to., Vol. 1, Part 1, Boston, 1866. Proceedings of the Academy of Natural Sciences of Philadelphia, Nos. 2 and 3, 1866, 8vo., Phil., 1866. Proceedings of the Essex Institute, vol. 5, No. 1, 8vo., Salem, 1866. Proceedings of the Boston Society of Natural History, vol. 10, Sheets 4-23, 8vo., Boston, 1866. Annals of the Lyceum of Natural History of New York, vol. 8, Nos. 6-12, 8vo., New York, 1865-6. Proceedings of the Chicago Academy of Sciences, vol. 1, Sheets 1-3, 8vo., Chicago, 1866. Proceedings of the American Academy of Arts and Sciences, vol. 7, 8vo., Boston, 1865-6. All the above were presented by the societies or authors named; and the foreign publications were received through the Smithsonian Institution.