The lessons to be learned from the KBS Tuff dating controversy are not that radiometric dating does not work, but that it works with some caveats. On March 20,two more dating studies in Nature criticized the earlier work and claimed that the kbs tuff dating of the KBS Tuff was 1. It was enough to know that the results were not in line with evolutionary expectations. Feel free to check out more of this website.
About Cassandra Davis kbs tuff dating
Wishing to establish the age of the primitive tools found by Kay Behrensmeyer, Leakey sends samples of the tuff to Jack Miller, a geophysicist at Cambridge University. Jack Miller along with his partner Frank Fitch duly dates the tuff and determines that it is somewhere between and million years old. Obviously they said, the ash had been deposited when rivers or streams had washed it down from highlands into a floodplain picking up minerals from older deposits in the process. Never mind that there was no evidence that the deposit had been deposited by rivers or streams, and never mind that they could not identify any exposed Triassic outcrops from which kbs tuff dating older minerals could have come from. It was enough to know that the results were not in line with evolutionary expectations.
Looks like you are using an old version of Internet Explorer - Please update your browser. If you already have an account, Sign in. Originally published in Creation 17, no 3 June A popular myth is that radioactive dating methods confirm the geologic time-scale and the concept of human evolution.
The pigs took it all. Creation 17 3 June: Origins quotes in blue. The KBS Tuff controversy illustrates many of the problems with radiometric dating, but it equally illustrates that the problems are not insurmountable.
The tuff is widely distributed geographically, and marks a significant transition between water flow and associated environmental conditions around Lake Turkana shortly after 2 Ma. Between the age of the tuff was the subject of intense academic dispute, with a variety of dates proposed by different geochemical and paleontological laboratories. Argon-argon dating has placed the age of the KBS Tuff at 1. The KBS Tuff marks a transition in the Turkana Basin from a stable to a fluctuating lake, partly filled by a river and delta system to the north and east of the basin. The date was called into question because efforts to replicate the findings produced KBS Tuff ages ranging from less than 1 to over Ma. A study of pig molar anatomy from the site, by Vincent Maglio and Basil Cooke, suggested an age closer to 2 Ma or even less, using methods of biogeochronology.
According to the National Museums of Kenyathe name comes from the Gabbra language:. In the language of the Gabbra people who live near the site, the term Koobi Fora means a place of the commiphora and the source of myrrh It is composed of claystones, siltstones, and sandstones that preserve numerous fossils kbs tuff dating terrestrial mammals, including early hominin species. Presently, the ridge is being eroded into a badlands terrain by a series of ephemeral rivers that drain into the northeast portion of modern Lake Turkana.
However, according to Spoor, SK has a "modern-human-like labyrinth" while "Stw 53 relied less upon bipedal behavior than the australopithecines. John Wiley and Sons: Although geologists can and do legitimately quibble over the exact age of a particular fossil or formation e. These new fossil Australopithecines seemed to show two parallel lines of development, one being a small "gracile" slender type and the other a larger "robust" type.