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Search results for: radiocarbon in all categories

445 results found.

45 pages of results.
21. Ice Cores and Catastrophism [Journals] [SIS Workshop]
... "greatest post-glacial eruption of Hekla" (Iceland), that at 1390 50 BC to Thera, and that at 2690 80 BC to an earlier eruption of Hekla. The matter of assigning these acid maxima is well worth scrutiny. In the case of the maxima at 1120 50 and 2690 80 the dates derived were matched up with the radiocarbon date yielded by ash from the Hekla volcano. Hekla (H3) had given a radiocarbon date of 950 130 BC and this was found to be in agreement with the ice core date of 1120 50 BC: Hekla (H4) had been radiocarbon dated to 2550 120 BC and this corresponded to the ice core date of 2690 80 ...
Terms matched: 1  -  Score: 178  -  05 Mar 2003  -  URL: /online/pubs/journals/workshop/vol0601/14ice.htm
22. Isotopic Anomalies in Chronometric Science [Journals] [SIS Review]
... ; his Ph.D . involved research into magneto-chemistry. The relative abundance of isotopes of an element in a sample often gives a clue to the sample's history. Radioactive decay is only one of the ways in which an isotopic abundance can be caused to deviate from the conventional norm. This has particular relevance to the Bristlecone Pine recalibration of radiocarbon dates. Introduction Roy MacKinnon's paper in the Summer 1977 issue of SIS Review (1 ) raised a number of important questions over the reliability of radiometric dating in Geochronology and related areas; perhaps the most serious being the discordance that can exist between datings obtained by different methods. If a discordant dating cannot be explained by experimental error or ...
Terms matched: 1  -  Score: 165  -  05 Mar 2003  -  URL: /online/pubs/journals/review/v0204/108iso.htm
23. Radiocarbon Dates and Cultural Change [Journals] [SIS Review]
... From: SIS Review Vol III No 4 (Spring 1979) Home | Issue Contents Radiocarbon Dates and Cultural Change Euan W. MacKie Dr MacKie, author of "The Megalith Builders" and "Science and Society in Prehistoric Britain", is Assistant Keeper in the Hunterian Museum of the University of Glasgow. He has excavated at Mayan and Scottish sites and published numerous articles and historic journals, and is a founder member of the Society. If severe natural catastrophes as suggested by Velikovsky affected a wide area in the past, this is likely to have resulted in marked cultural discontinuities - rise and fall of cultures, movements of peoples, etc. In its important role of ...
Terms matched: 1  -  Score: 163  -  06 Mar 2003  -  URL: /online/pubs/journals/review/v0304/098radio.htm
... of geological perturbation at that time, and I propose to discuss it under the following headings: 1). initiation of crustal movements 2). global sea level discontinuities 3). earthquake activity 4). a unique volcanic eruption pattern 5). a transient in the geomagnetic field, and 6). a transient in the atmospheric radiocarbon level The primary dating method for geological deposits under 50,000 years old is radiocarbon dating. Radiocarbon measurements are performed on marine organisms along boundaries of oceans, lakes and rivers, on organic material adjacent to volcanic tephra (dust) or lava, and on organic material associated with objects undergoing thermoremanent magnetism measurements. As in the earlier ...
Terms matched: 1  -  Score: 161  -  05 Mar 2003  -  URL: /online/pubs/journals/review/v1988/11model.htm
... From: Pensée Vol. 3 No 2: (Spring-Summer 1973) "Immanuel Velikovsky Reconsidered IV" Home | Issue Contents Ages in Chaos in the Light of C14 Archaeometry Albert W. Burgstahler, Euan W. MacKie Radiocarbon dates and the chronology of Egypt Dr. Burgstahler is professor of chemistry, University of Kansas. Dr. MacKie is assistant keeper, Hunterian Museum, University of Glasgow (Scotland). The text of this paper, prepared by Burgstahler, is based on a presentation given at the Velikovsky Symposium, Lewis and Clark College, Portland, Oregon, August 16-18, 1972. The chart of C14 dates was prepared by MacKie. Introduction Among most scholars the ...
Terms matched: 1  -  Score: 157  -  05 Mar 2003  -  URL: /online/pubs/journals/pensee/ivr04/33ages.htm
... would not be compatible with his other claim, that the specific theories "follow from the general ones," and he would still be in trouble. After his preliminary remarks on theory testing- remarks that I consider untenable- MacKie proceeds to the main business of his paper, which is the testing of Velikovsky's theories of catastrophism on the basis of radiocarbon dating procedures. MacKie believes that these procedures will ". . demonstrate the contemporaneity, or otherwise, between major environmental changes (such as altera- tions in the sea level, in the extent of the ice sheets, volcanic eruptions) and human events (such as migrations and the destruction of cities and cultures)." But ...
Terms matched: 1  -  Score: 142  -  05 Mar 2003  -  URL: /online/pubs/journals/pensee/ivr05/34logic.htm
27. Letters [Journals] [SIS Review]
... should be borne in mind that the proportion of C14 to total carbon in the atmosphere is minute, in the region of 1.4 x 10-12. The statement on p. 41 of Review XIII that C14 should be formed at the rate of 1.21% of total atmospheric carbon per century' should have read of total atmospheric radiocarbon per century', and the figure of 1.21% needs to go up to about 70% of total atmospheric radiocarbon per century. We are therefore left with a much less severe fluctuation which appears to be within the bounds of conventional theory. See for example reference 3 where their model gives fluctuations equivalent to the more violent ...
Terms matched: 1  -  Score: 132  -  05 Mar 2003  -  URL: /online/pubs/journals/review/v1992/60letts.htm
... From: Pensée Vol. 3 No 1: (Winter 1973) "Immanuel Velikovsky Reconsidered III" Home | Issue Contents A Quantitative Test for Catastrophic Theories Euan W. MacKie Radiocarbon Dating and Catastrophism Dr. MacKie is assistant keeper, Hunterian Museum, University of Glasgow. Antiquity (December, 1971) published a paper by him entitled "Some Thoughts on Radiocarbon Dating." The paper published here was first read at the Velikovsky Symposium, Lewis and Clark College (Portland, Oregon), August 17, 1972. When assessing and testing theories which are as revolutionary and wide-ranging in their content and implications as those of Dr. Velikovsky, it is most important to define ...
Terms matched: 1  -  Score: 127  -  05 Mar 2003  -  URL: /online/pubs/journals/pensee/ivr03/06quant.htm
... From: SIS Review Vol II No 3 (1977/78) "From Exodus to Akhnaton" Home | Issue Contents Radiocarbon Dates for the Eighteenth Dynasty Euan MacKie Dr MacKie is the Assistant Keeper of Archaeology and Ethnography at the Hunterian Museum of the University of Glasgow. He has contributed articles to numerous journals, and is the author of "Science and Society in Prehistoric Britain". He is a founder of the Society and a contributor to Pensée and the S.I .S . Review. Despite Dr Velikovsky's endeavours radiometric data from the New Kingdom of Egypt is still very limited. The results given by samples tested and published are collected in the accompanying table and ...
Terms matched: 1  -  Score: 122  -  06 Mar 2003  -  URL: /online/pubs/journals/review/v0203/95radio.htm
... to separate effects of climate and surface/subsurface hydrological effects. Other techniques which are applied on a more limited level are marine organism population behaviour and growth, and animal migrations. Lake and river levels can be a good index of precipitation level as long as hydrological factors are relatively separated. The inaccuracies of these techniques combined with those of radiocarbon measurements would be expected to yield a larger spread in the dating of the evidence: surprisingly, the dates cluster around 2300 BC fairly closely. As a general comment, whenever a date of 2500 or 2000 BC is given by an investigator, it represents a gross estimate rounded off to 500 year increments: this writer indicates those values ...
Terms matched: 1  -  Score: 122  -  05 Mar 2003  -  URL: /online/pubs/journals/review/v1987/34model.htm
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