Pleistocene Glaciation: A Criterion for Recognition of Its Onset

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Science  23 Jul 1965:
Vol. 149, Issue 3682, pp. 442-443
DOI: 10.1126/science.149.3682.442


The various biostratigraphic boundaries proposed for the base of the Pleistocene are not necessarily synchronous with the onset of continental glaciation. Electron-microscopic examination of surface textures of sand grains suggests a widely applicable rock-stratigraphic and geologic-climate boundary that may mark the point at which glaciers of continental proportions began to launch debris-carrying icebergs into the world's oceans.