Final answer:
The statement is false. The claim that the oldest dinosaur fossils were found in Brazil is false; the oldest fossils were discovered in Argentina and Madagascar. The law of superposition and contributions by citizen scientists to paleontology are notable aspects related to fossil discoveries.
Step-by-step explanation:
The statement that the oldest dinosaur fossils were discovered in Brazil is false. The oldest known dinosaur fossils have been found in other parts of the world, including Argentina and Madagascar, dating back to the Late Triassic period. In Brazil, there have indeed been discoveries of dinosaur fossils, but they do not represent the oldest known to science. When discussing discoveries such as these, it is also important to mention the law of superposition, which helps scientists determine the relative ages of fossil layers. It's interesting to note that citizen scientists, like a rock shop owner, have contributed to significant paleontological finds, including the discovery of the first fossilized dinosaur eggs in the western hemisphere by Jack Horner.