# The "youngest" rocks in the records of the United States Geological Survey have an apparent age of 700,000 years. Geologists therefore would not be able to date the eruption of, say, [[Mount Vesuvius]] did not ample historical evidence exist to date it independently. | # The "youngest" rocks in the records of the United States Geological Survey have an apparent age of 700,000 years. Geologists therefore would not be able to date the eruption of, say, [[Mount Vesuvius]] did not ample historical evidence exist to date it independently. |