Glacial vs Paleocrystic - What's the difference?

As a proper noun glacial

is (geology) of the pleistocene period dominated by the presence of glaciers.

of, pertaining to, or derived from a former glacial formation.

(en adjective)

of, or relating to glaciers

* We examined the glacial deposits

(figuratively) very slow

* 2010 , "Under the volcano", The Economist , 16 Oct 2010:

Progress on judicial reform has been glacial , meeting enormous resistance.

cold and icy

* After the rain and frost, the pavements were glacial

having the appearance of ice

* On cold days, glacial acetic acid will freeze in the bottle

cool and unfriendly

* He gave me a glacial stare

* englacial * interglacial * monoglacial * postglacial * preglacial * proglacial * subglacial * supraglacial ----

(-)

Of, pertaining to, or derived from a former glacial formation.

(Webster 1913)