Another influential application of stratigraphy in the early 19th century was a study by Georges Cuvier and Alexandre Brongniart of the geology of the region around Paris.Variation in rock units, most obviously displayed as visible layering, is due to physical contrasts in rock type (lithology).However, relative methods are , which is that if there are layers of deposits, those laid down first will be on the bottom and those laid down last will be on the top. However, geological strata are not always found to be in a neat chronological order.
Even many evolutionists ruefully admit that this charge is undeniable with regard to the circularity invoked in dating rock layers.
In the past, relative dating methods often were the only ones available to paleoanthropologists.
As a result, it was difficult to chronologically compare fossils from different parts of the world.
10, 2010.) “In about 1830, Charles Lyell, Paul Deshayes, and Heinrich George Bronn independently developed a biostratigraphic technique [geologic column] for dating Cenozoic deposits based on relative proportions of living and extinct species of fossil mollusks….
Strangely, little effort has been made to test this assumption.