Want to see a "young earther" squirm?
Ask 'em how many years of obvious high organic/low organic deposits there are in the outflow of the Colorado River ... Spring floods from melting snow wash organic material into the river's delta. The rest of the year, it's pretty much all inorganic. The layers are easily counted in core samples ... There are a lot more than a million layers.
 Nicely halted by the Imperial Valley and LA drinking it all, but that's another rant.