quaternary

And the bones of man himself appear, extending through what is known as the Quaternary or Pleistocene period.

Subspeciation has been enhanced by the late Quaternary mountain building which was prevalent over the western United States.

A distinct species characterised the Quaternary deposits of South America.

The Tertiary and Quaternary formations are partly of marine and partly of terrestrial and fresh-water origin.

The Post-tertiary or Quaternary division comprises the concluding chapters of geological history.