0 from or referring to the period of time between about 66 and 23 million years ago, in which many insects, mammals, and birds appeared:
1 the period of time between about 66 and 23 million years ago, in which many insects, mammals, and birds appeared:
The ancestors of modern camels evolved in North America during the Palaeogene period.
In England, Palaeogene rocks are preserved in two E–W trending tectonic basins, the London Basin and the Hampshire Basin.
Scientists previously believed dyrosaurids diversified in the Palaeogene.
Across ecosystems, the Palaeogene also marks a rapid radiation of new species filling in empty ecological niches.
