Pliocene Epoch, the geologic epoch that began about 6,000,000 years ago and lasted about 4,000,000 years. It is a subdivision of the Tertiary Period of the Cenozoic Era. Great uplifting occurred in the mountains of the northwestern United States during the Pliocene Epoch. Pliocene formations in California are sources of petroleum.
In "Indiana Jones and the Last Crusade," Dr. Jones battles the Nazis for the Holy Grail. Did the Nazis really have an interest in archaeology? And if so, what fueled it?
Paleontology, the study of fossils, or plant and animal remains from past geologic time.