Everything in geology is quite easily accommodated in 6000 years.
Horsefeathers! By 1830 the protogeologists in England and France had given up on a young earth, a lifetime before radioactivity was even discovered. And several of them, like William Buckland, were lifelong Christians and defenders of the faith.
"The Christian church, in its attitude toward science, shows the mind of a more or less enlightened man of the Thirteenth Century. It no longer believes that the earth is flat, but it is still convinced that prayer can cure after medicine fails." H L Mencken