Although the hominid fossil record is far from complete, and the evidence is often fragmentary, there is enough to give a good outline of the evolutionary history of humans.
The time of the split between humans and living apes used to be thought to have occurred 15 to 20 million years ago, or even up to 30 or 40 million years ago.
Using careful analogies and written historical records, the authors help students understand the development of the geologic time scale, including how this depended on gathering evidence and making comparisons.
The major time periods in earth's history are introduced, as well as are fossils and the role they play in helping us understand this history.
This species was named in July 2002 from fossils discovered in Chad in Central Africa (Brunet et al. It is the oldest known hominid or near-hominid species, dated at between 6 and 7 million years old.It discusses how Darwin's theory gave scientific meaning to the observed succession of once-living species in the record of earth's history preserved in the rocks.This lesson is based on information included in Fossils, Rocks, and Time, part of the United States Geological Survey website.Preview the information at this site and decide whether it would be best to print the text ahead of time, or allow students to read it online.Another option would be for you to order print materials directly from the USGS.The method most commonly used in archaeology is carbon dating.