Chapter 21

The Post-Pliocene period--Division of the Quaternary deposits into Post-Pliocene and Recent--Relations of the Post-Pliocene deposits of the northern hemisphere to the "Glacial period"--Pre-Glacial deposits--Glacial deposits--Arctic Mollusca in Glacial beds--Post-Glacial deposits--Nature and mode of formation of high-level and low-level gravels--Nature and mode of formation of cavern-deposits--Kent's Cavern-Post--Pliocene deposits of the southern hemisphere.