An abrupt end to the time period in which Dinosaur fossils are found would show that the mammals competed with them and drove them to extinction, however an abrupt end to the fossil records of dinosaurs would indicate extinction due to a global catastrophe. Different locations and Fossil quarries give varying results and therefore no absolute conclusion has been reached on this theory. New finds and evidence brings new light to this debate but it is established knowledge that dinosaurs and mammals did evolve together and may have competed for natural resources. I hope this helps. You can drive your own conclusion from this too..
There is only one piece of evidence that supports the mammal competition hypothesis. After viewing the details of this evidence and its relation to the mammal competition hypothesis, do you think this is a widely accepted conclusion in the scientific community? Explain your answer