Unfossilized tissue of a mosasaur bone from the Maastrichtian Phosphatic Chalk of Ciply, Belgium was carbon dated to an 'age' of 24,600 years BP. The “chronostratigraphic unit” is the name assigned to the layer of rock.
It carbon dated to an uncorrected 'age' of 33,720 ± 430 years BP.
There is no independent natural clock against which those assumptions can be tested.
For example, the amount of cratering on the moon, based on currently observed cratering rates, would suggest that the moon is quite old.
A coalified stump found in the Upper Permian coal bed in Sydney, Australia was assigned an age of 250 million years according to the geologic column.
It carbon dated to an uncorrected 'age' of 33,700 ± 400 years BP. Chaffin (El Cajon, California: Institute for Creation Research, and Chino Valley, Arizona: Creation Research Society, 2005), pp. Diamonds are the the hardest known naturally occurring substance and the chemical construction make them highly resistant to contamination.