Dino Dating Conflicts: Carbon dating suggests less than 40,000 years old.

Here is an explanation:

Dr. Thomas Seiler, a physicist from Germany, gave the presentation in Singapore.  He says that his team and the laboratories they employed took special care to avoid contamination.  That included protecting the samples, avoiding cracked areas in the bones, and meticulous pre-cleaning of the samples with chemicals to remove possible contaminants.  Knowing that small concentrations of collagen can attract contamination, they compared precision Accelerator Mass Spectrometry (AMS) tests of collagen and bioapatite (hard carbonate bone mineral) with conventional counting methods of large bone fragments from the same dinosaurs.  "Comparing such entirely different molecules as minerals and organics from the same bone region, we obtained concordant C-14 signals which were well below the upper limits of C-14 dating.  These, together with many other remarkable signal concordances between samples from different fossils, geographic regions and stratigraphic positions make random contamination as origin of the C-14 signals unlikely", he notes.  "If dinosaur bones are 65 million years old, there should not be one atom of C-14 left in them."