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Search results for: dendrochronolog* in all categories
128 results found.
13 pages of results.
91. ALL Honorable Men [Books]
... of these Bristlecone pine trees. The first "fact" they have omitted is that the chronology of these California trees is well-known to be uncalibrated by comparing it with a known period of modern climate data and is, therefore, "suspect," as providing evidence of anything. As John Gribbin explains: "First . . . the dendrochronologists [tree ring scientists] have to establish that in living trees the [oxygen -16 and oxygen -18] isotopes do not migrate across the tree rings, garbling the temperature record. This can be done by calibrating the outer rings of living trees against the historical record of temperature variations, before using inner rings to find out temperature changes ...
92. The Past Comes Down [Journals] [SIS Workshop]
... It has been possible to adduce comprehensive corroborating evidence in support of this thesis. As a first step it had to be shown how questionable and unreliable our presently used dating methods really are: the radiocarbon method, although seemingly overthrowing, from 1949 onwards, all earlier dates, in its turn had been calibrated, with the help of the dendrochronological method, in a revolutionizing manner. The unreliability factors of this method are of such magnitude that we will have to abandon it completely [2 ] (29). Since Heinsohn has seriously questioned the Assyriological, Sumerological and the Egyptological chronologies [3 ], the only way left seemed to be the abandonment in toto of all such ...
93. The Dust-up Over Ice Cores [Journals] [SIS Workshop]
... , requiring an allowance of plus or minus ten years increasing with depth until the layers are too thin to distinguish at about the 9,000 year level, where the dating allowance is 150 years plus or minus. This method of counting dates is similar to the familiar annual growth rings of trees, where through observation and practical experience, dendrochronologists have learned to match different cross-sections of long-lived trees such as the European Oak until they have sequences going back several millennia. While these are mainly of use in climatic studies, the width of these rings responds to conditions during the growing year, giving a wide ring in a good growing season, while extreme cold returns what is usually ...
94. Index of Titles
... of a Proper Identification of the Labyrinth Lasken, Jesse E.: Chronological Placements of the Dynasties of Manetho Lasken, Jesse E.: Egyptian Chronology - The Multiple Name Factor Lasken, Jesse E.: Egyptian Language Anomalies Lasken, Jesse E.: Misusing Radiocarbon: A Case Study Lasken, Jesse E.: Should the European Oak Dendrochronologies be Re-examined? Lasken, Jesse E.: Site Stratification: is it a Sound Methodology? Lawrence, Terry: Shiloh LeFlem, K. A.: More on Apollo LEFLEM, K. A.: Amenophis, Osarsiph and Arzu. More on the Third Intermediate Period of Egypt Leinweber, David Walter: Lucid Dreaming and Visualization ...
95. Comets and the Bronze Age Collapse [Journals] [SIS Workshop]
... field work could reveal. Some indicators may already be evident, such as the abandonment of many long settled sites, a large southward movement of people from the higher latitudes, and a steep, long-term (1159-1140 B.C .) decline in the annual growth of Irish bog oak that stands out in the 7,272 year long dendrochronological record, based on this species of tree [2 ]. Definitive evidence of impact, however, can only come from a detailed analysis of debris directly overlying destruction sites. I urge archaeologists working on this time period to diligently collect dust and debris from cracks and crevices where violent destruction is apparent. In 1992 the current Greenland ice ...
96. Thoth Vol IV, No 9: May 31, 2000 [Journals] [Thoth]
... are the eminent astronomers Fred Hoyle and Tom Van Flandern. According to the latter theorist, an "exploding planet" devastated the surfaces of Mars and other bodies in the solar system, perhaps leaving its scars on human imagination as well. And now, a half century after Worlds in Collision, a few well- accredited catastrophists, including dendrochronologist Mike Baillie, are beginning to admit a debt to Velikovsky, usually with the disclaimer that of course he was wrong about unstable planets being involved in these events. This general assessment of Velikovsky is shared openly by the popular science and science fiction writer, Jerry Pournelle, on his website : "Taken as a whole, Velikovsky's specific ...
97. Ice Cores of Greenland [Books] [de Grazia books]
... a chance to observe a dust layer(s ) and/or volcanic acid layer(s ) that one would expect to be significantly thicker or more concentrated than those which are known to have been produced by large, single, historical eruptions [4 ]. Hitherto, analogous technologies have threatened, namely carbondating, soil varves, and dendrochronology, but quantavolutionaries have learned to coexist with them. In at least the first two instances, the catastrophic event may itself adjust the hands of the geological clock, while in the third case, the trees to provide the data are limited in space and time. Setting up Mother Nature to count out past time has inspired other technologies ...
98. Ages in Chaos in the Light of C14 Archaeometry [Journals] [Pensee]
... . Clark and C. Renfrew, "Tree-ring Calibration of Radiocarbon Dates and the Chronology of Ancient Egypt," Nature, 243, June 1, 1973, 266). Later in the present discussion further consideration will be given to this general problem. ** Some of the possible reasons for these differences between results of C-14 dating and dendrochronology are discussed by Professor Libby in his article. For an instructive comparison of the Suess and Pennsylvania laboratory treering calibrations, see the recent article by Gary A. Wright, "Bristlecone Pine Calibrations of Radiocarbon Dates: Some Examples from the Near, East, " American Journal of Archaeology, 77 (1973), 197. - Ed ...
99. The Pitfalls of Radiocarbon Dating [Journals] [Pensee]
... a paper by Manley in 1949 (Science News, Penguin Publication) told of the work of G. Folghereiter done at the turn of the century on Attic and Etruscan pottery: he found that the polarity was reversed in the eighth century before the present era. To determine the extent of correction necessary to render the radiocarbon method reliable, dendrochronologists devised a plan to control the radiocarbon dates by building a chronology of tree rings of the white bristlecone pine, the longest living tree. The method caught the fancy of the radiocarbon researchers. However, three or four rings formed in one year is not uncommon, especially if the tree grows on a slope with the ground several times ...
100. Heinsohn's Revised Chronology [Journals] [Aeon]
... . Supporters of radical revisions of the generally accepted chronology for ancient times such as Immanuel Velikovsky, Donovan Courville, and now Gunnar Heinsohn, usually consider radiocarbon dating unreliable. They emphasize problems with the method and questions which have arisen about the constancy of the atmospheric ratio of carbon-14 to carbon-12. But rejection of radiocarbon dating also means rejection of dendrochronology (tree-ring dating), one of the most accurate dating methods yet developed. (23) A tree-ring sequence 7,000 years long has been developed from the long-lived bristlecone pine trees of the southwestern United States. Rings from this sequence have been radiocarbon dated, and the results have been used to form a calibration curve for the ...
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