Would you expect to find dinosaur fossils in undisturbed rocks that are above the iridium layer?

you wouldn't expect to find fossils due; Still, the Alvarezes' hypothesis faced another hurdle: No dinosaur fossils had been found any higher than 3 meters below the K-T boundary, a gap which equates to about 100,000 years. Most researchers concluded that the dinosaurs went extinct before the asteroid impact and that they died off gradually.