n.a made-up name for a geological
period in the earth's
history. Geology is the scientific
study of the earth's substance, physical structure and the forces affecting its appearance and development, as well as the
history of
life forms (
living or extinct) as recorded in
rocks. In geology,
different spans of
time in earth's
history are divided into chronological periods according to
major physical changes in the earth such as the redistribution of land and
sea and the forming of new mountain ranges.