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Ph D in Applied Sciences for the Protection of the Environment and of Cultural Heritage, Department of Earth Sciences, Sapienza-University of Rome, Aldo Moro 5, 00185 Rome, Italy E-mail: [email protected]: 39-064454729 Tel: 39-0649914155 A multi-analytical approach has been applied to characterize Khirbet Kerak Ware from the archaeological site of Khirbet al-Batrawy (Jordan), a highly distinctive pottery production of Early Bronze III Levant.

Even when the absolute dates are available, we have to supplement the information with relative dating.Further confusion arises when one publication or geologist says, for example, that the Kaibab Formation is 270 m.y. The same questions arise for the other rock units at Grand Canyon. This article will answer these questions by providing a short primer on geologic dating methods and how they were applied to Grand Canyon rocks.We then describe Grand Canyon rocks as belonging to three “sets,” or packages of rocks, each with unique geologic histories, and present a compilation of “best” numeric ages for Grand Canyon rocks to use when explaining Grand Canyon geology to the public.With a rock record that spans more than 1500 m.y., Grand Canyon is truly a panoramic view into the geologic past.Nonetheless, how geologists determine the age of rocks is a mystery to many members of the public, and even to many park rangers [see Photo 2], guides, and others who share the canyon’s geologic story with others. ” when geologists say a Grand Canyon rock formed 270 million years ago.According to the most recent edition of the Franklin-Sterling Hill Gem & Mineral Show brochure, the region produces a whopping 366 distinct, valid mineral species; 70 Type Locality minerals (locality of first preserved specimens); 6 native elements and 19 total unique minerals found no place else on the planet.

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