Do fossil teeth that lack abrasion indicate that dinosaurs survived the Cretaceous extinction?

The Hell Creek formation of Montana represent sediments deposited by rivers in the time period following the supposed extinction of dinosaurs 65 million years ago. These rocks include pollen grains that have been dated to be younger than 65 million years old as well as dinosaur teeth. Sediments transported long distances in rivers typically show surface abrasion from collisions during the transport process.

Since the dinosaur teeth found in the Hell Creek formation lack abrasion, one group of geologists have suggested that the teeth represent dinosaurs that survived the Cretaceous extinction. An experiment was devised to determine if dinosaur teeth would be abraded in river transport. Five teeth of various sizes were mixed with sand similar to that in the Hell Creek formation in a rotating rock tumbler.

The teeth were examined at various intervals for changes in weight and visual signs of abrasion. From the measurements of the tumbler diameter, rate of rotation, and duration of the ... more.

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