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They concluded that the various Pleistocene ash deposits could be considered a datum of early Yarmouthian age (Fig.1), even though in 1946 Swineford and Frye concluded there might be as many as three Pleistocene ash falls--all of about mid-Pleistocene age. It was not until the 1960's that new evidence was presented indicating that the "Pearlette ash" might be multiple in nature.

To continue, sign up for a digital subscription at a special introductory rate of only 99¢ for the first month. If you're already a subscriber, click on Log in below. Sign up now for a digital only subscription to for only 99¢ for the first month.The stratigraphic position of the "Pearlette" volcanic ash is shown by large dots. More recently, chemical, mineralogical, and geochronological studies have verified earlier interpretations of more than one Pleistocene ash in the Great Plains and have shown that some of the ashes are greatly separated in time (Izett and others, 1970, 1972; Naeser and others, 1973; Boellstorff, 1972, 1973a, b).(Used by permission of the University of Chicago Press from John C. Byron Leonard, "Correlation of Pleistocene deposits of the Central Great Plains with the glacial section," Journal of Geology, Vol. With further studies, the known number of Pleistocene volcanic ashes is increasing.Seven-day newspaper subscribers get digital access at no extra charge; add it to your current subscription here. As a digital only subscriber you have access to all of our digital products -, mobile, apps, and e Paper.Introductory price converts to $9.95 after the first month.Click here and you will just need to provide your subscription address and phone number to confirm that you are eligible for All Access, which is the key to all the information our team produces.

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