Exam 23: Geologic Timereading the Rock Record

During the Cenozoic era animals grew to great sizes and proportions. The wooly mammoth and the saber tooth tiger were much larger than animals we see today. Some of the causes for their extinction may be

An eroded surface of metamorphic rocks on which a horizontal bed rests is called a

To date relatively young rocks and materials, we use the decay of

By radiometric dating, the oldest mineral in a sedimentary rock was found to be 1.4 million years old. What is the age of the sedimentary rock?

The most noteworthy highlight of the Mesozoic era was the