This could even be the case when the K-Ar and Ar-Ar analyses yield "dates" compatible with other radioisotopic "dating" systems and/or with fossil "dating" based on evolutionary assumptions. Furthermore, there would be no way of knowing, because the Ar not from radioactive decay, except of course by external assumptions about the ages of the rocks. When rocks are heated to the melting point, any Ar-40 contained in them is released into the atmosphere.When the rock recrystallizes it becomes impermeable to gasses again.For the original sources of these data, see the references in A. Snelling, "The Cause of Anomalous Potassium-Argon ' Ages' for Recent Andesite Flows at Mt. Ngauruhoe, New Zealand, and the Implications for Potassium-Argon ' Dating'," R. PALEONTOLOGY - PALAEONTOLOGY Paleontology - Palaeontology Blogs, News, etc. For more information see the American Journal of Roentgenology or the American Roentgen Ray Society Archaeometry Databases THE LIMESTONE SCULPTURE PROVENANCE PROJECT DATABASE - The Limestone Sculpture Provenance Project; Sponsored by the International Center of Medieval Art (ICMA) Multimedia The Limestone Sculpture Provenance Project Database (Text & Images). The Limestone Sculpture Provenance Project Database "...samples of stone removed from a sculpture, monument or quarry are bombarded in a nuclear reactor to produce radioactive isotopes of elements present in the stone..." "... C.), Hierakonpolis the City of the Hawk is the most important site for understanding the foundations of Egyptian civilization..." For more information see Interactive Digs; Archaeology or the Archaeological Institute of America THE PYRAMIDS AND TEMPLES OF GIEZEH - R. For more information see The Pyramids and Temples of Giezeh or Ronald Birdsall's Home Page THE TOMB OF SENNEFERI - N. Broodbank (Mediterranean Archaeology, Institute of Archaeology, University College London) & E. Hamerow, Institute of Archaeology, School of Archaeology, University of Oxford Multimedia Novum Inventorium Sepulchrale - Kentish Anglo-Saxon Graves and Grave Goodsin the Sonia Hawkes Archive (Text & Images). Roufs, Anthropology, Department of Sociology & Anthropology, College of Liberal Arts, University of Minnesota, Duluth, Minnesota Multimedia Mesoamerican Course (Text & Images). Ancient Middle America broadly explores the nature, origin, and development of the great prehistoric cultures of these countries..." For more information see Tim Roufs' Home Page Databases JOHN MONTOGOMERY DICTIONARY OF MAYA HIEROGLYPHS (QUICKTIME & WINDOWS MEDIA PLAYER) - Author: John Montgomery, Hosted by the Foundation for the Advancement of Mesoamerican Studies, Inc. Available in English, Spanish & Maya Words and Syllables.
Further confirmation comes from diamonds, which form in the mantle and are carried by explosive volcanism into the upper crust and to the surface. obtained a K-Ar isochron "age" of 6.0±0.3 Ga for 10 Zaire diamonds, it was obvious excess was inherited from the mantle source areas of the magmas. Snelling, "Discordant Potassium-Argon Model and Isochron ' Ages' for Cardenas Basalt (Middle Proterozoic) and Associated Diabase of Eastern Grand Canyon, Arizona," in R.
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Forensic Anthropology, Human Osteology, Human Paleopathology Courses, Lectures, Lessons, etc. Gandin; American Journal of Roentgenology 2003; 17-606, American Roentgen Ray Society Multimedia Paleoradiology Lessons (Text & Images). There are also many interactive ground plan maps, photos, paintings and drawings..." "..largest site from the Pre- and Protodynastic period (3800-3100 B. Shaw (Assistant Director of the excavations at Kommo); Hosted by the Art Department, Faculty of Arts & Sciences, University of Toronto Multimedia Kommos Excavation Crete (Text & Images). Kommos Excavation Crete For more information see the Art Department KYTHERA ISLAND PROJECT (KIP) - KIP Directors; C. Example of the "Kythera Island Project" Subject Categories & Subcategories include For more information see the Institute of Archaeology MINOAN CRETE - Author: Ian Swindale, Rethymno, Crete Multimedia Minoan Crete (Text, Images, Videos/Movies & Audio/Sound). The aim of this web site is to provide a well illustrated introduction to all the major and many of the minor archaeological sites of Minoan Crete,..." IRON AGE (CELTIC) COIN GUIDE INCLUDING THE OXFORD CELTIC COIN INDEX - Portable Antiquities Scheme, British Museum & the School of Archaeology, Oxford University Multimedia "Iron Age (Celtic) Coin Guide including the Oxford Celtic Coin Index" Database (Text & Images). The data presented in this web site represents the first stage of dissemination..." For more information see Materials and Technology; Research Projects; Institute of Archaeology or the School of Archaeology NOVUM INVENTORIUM SEPULCHRALE - KENTISH ANGLO-SAXON GRAVES AND GRAVE GOODS IN THE SONIA HAWKES ARCHIVE - Project Director: H. Ancient Middle America "...provides an introduction to Prehistoric Mexico, Guatemala, Belize, and Honduras.
These each have 19 protons and 21 neutrons in their nucleus.
If one of these protons is hit by a beta particle, it can be converted into a neutron.
It is based on the fact that some of the radioactive isotope of Potassium, Potassium-40 (K-40) ,decays to the gas Argon as Argon-40 (Ar-40).