preglacial

[ pree-gley-shuh l ]

/ priˈgleɪ ʃəl /

prior to a given glacial epoch, especially the Pleistocene.

Origin of preglacial

First recorded in 1850–55; pre- + glacial

Many of the valleys of our present rivers are but patchworks of preglacial, interglacial, and postglacial courses (Fig. 366).

The Elements of Geology |William Harmon Norton
In the former case the present drainage is through valleys which are preglacial in some places, and postglacial in others.

The Geography of the Region about Devils Lake and the Dalles of the Wisconsin |Rollin D. Salisbury
The stream has not yet reached its preglacial profile, but it has almost reached it.

The Andes of Southern Peru |Isaiah Bowman
Very likely preglacial man was similarly destitute of this art.

Man And His Ancestor |Charles Morris

As has been shown, this valley was probably occupied in preglacial time by Rocky River, which then flowed southward.

Drainage Modifications and Glaciation in the Danbury Region Connecticut |Ruth Sawyer-Harvey

preglacial

/ (priːˈɡleɪsɪəl) /

formed or occurring before a glacial period, esp before the Pleistocene epoch