For example, the fossil record of horses tells us that horses used to be considerably smaller than they are today, which can be seen in this illustration of different fossils over time.The older horse fossils come from 50 million year old rock, which was formed during the Eocene epoch.
The fossil record is a huge collection of fossils that document the history of life on Earth.
The fossil record is filled with example organisms from Earth's past.
Extinct means that all members of a species or another grouping of organisms have died off.
Therefore, everything we know about dinosaurs comes from the fossil record.
During this time, horses were about 0.4 meters tall.