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If it is not the flows' age, that is not a "problem" with isochron dating, and it is not relevant to the large number of Rb/Sr isochrons which were computed from mineral separations of a single object.At the GSA meeting, Austin discussed the inheritance of a mantle age.The attempt to abuse the meaning of a single contrived date -- which was produced only by a sample selection geared to dating a different event, and only for samples whose results were known by Austin in advance -- says a lot more about the level of competence or honesty in this creation "science" research program, than it says about the validity of isochron dating methods.Even if given credit for discovering this case (which he clearly doesn't deserve, as his use of Leeman's data proves), Austin has only managed to "call into question" a particular sampling technique.The geological relationships of the various formations are quite clear.The lava flows which spill into the canyon must be younger than the canyon.He didn't pretend that the age of the flows was the expected result, and he didn't make the false claim that his result was sufficient to call all isochron dating into question.

They would argue for a much shorter absolute timescale than mainstream geologists would accept, but the relative sequence is agreed upon by all parties. Steven Austin, chairman of the Geology Department at the Institute for Creation Research, claimed (1992) that he had derived an isochron for the plateau flows, which indicates an age of about 1.3 billion years.An angular unconformity is the result of tilting and eroding of the lower layers before the upper ones are deposited.These tilted and eroded layers are Precambrian in age (blue in Figure 1, above).One particular Precambrian layer known as the Cardenas Basalt has been dated by radiometric methods to about 1.1 billion years in age.The Cenozoic flows sampled by ICR thus are claimed to yield an age which is about 200 million years older than the Cardenas Basalt.

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