Geological strata dating
Therefore, a rock's physical appearance cannot, with certainty, distinguish the system or strata level to which a rock may belong.
The sequence of rock types is more useful, but hardly an infallible guide to correlation.
In some locations such structural changes can be supported by physical evidence while elsewhere physical evidence of the disruption may be lacking and special pleading may be required using fossils or radiometric dating.
Sandstone, limestone, dolomite, shale, chert, salt, conglomerate, coal and other rock types are not diagnostic of specific strata systems.
Frequently, these discordant isochron plots "date" strata systems much older than even the accepted old ages customarily assigned to the systems of the geologic column.
A single sedimentary lamina, or bed, was supposed by uniformitarian geologists to represent typically a year or many years duration.
It was concluded, therefore, that multiplied thousands of laminae and beds superimposed required millions of years.
Geologists should be asking which, if any, of the isochron plots should be accepted as "absolute ages," and if the discordances do not falsify the assumptions upon which radiometric dating is based.
Geologists need to consider radiometric methods which indicate ages of Books, films and museum displays contain illustrations asking us to visualize what earlier "geologic ages" were like.