Geology Reference
In-Depth Information
dications that they were able to regulate their body temperature (they were
endo-
thermic
). Many of these seemingly subtle and detailed changes are documented
with fossil evidence illustrating multiple stages between the reptilian therapsid
traits and the mammalian cynodont traits.
The early mammals evolved and diversified during the late Mesozoic, but I cover their
evolutionary history in more detail in Chapter 21, where I discuss the Cenozoic period,
also known as the Age of Mammals.
