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Valley, Ventura County, California. In the history of North American mammal life this fauna has a position immediately antecedent to that of the Titanotherium Zone. Above this stage in the Sespe is a considerable thickness of land-laid material and some of these deposits are without much doubt lower Oligocene in age although in the absence of fossil remains this cannot be definitely proved at the present time. 2 Gilbert, G. K., U. S. Geog. Surv. West 100th Mer., Wheeler Surv., 3, 33 (1875). 3 Turner, H. W., U. S. Geol. Surv. 21st Ann. Rpt., Pt. 2, 197-208 (1900). 4 Spurr, J. E., Jour. Geol., 8, 633 (1900). 6 Spurr, J. E., U. S. Geol. Surv. Bull., 208, 19, 185 (1903). 6 Spurr, J. E., U. S. Geol. Surv. Prof. Pap. 42, 51-70 (1905). 7Ball, S. H., U. S. Geol. Surv. Bull., 308, 32-34, 165-166 (1907).

proceedings of the national academy of sciences of the united states of america

Adoption of the Meter-Kilogram-Mass-Second (M.K.S.) Absolute System of Practical Units by the International Electrotechnical Commission (I.E.C.), Bruxelles, June, 1935