The whole land area at the time of flooding was virtually a peneplain.
"The Lani People" by J. F. Bone
This surface, or "peneplain," was probably the result of denudation working away the beds almost to sea-level.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 4" by Various
These broad expanses are, in fact, local peneplains developed on areas of soluble limestone.
"Drainage Modifications and Glaciation in the Danbury Region Connecticut" by Ruth Sawyer-Harvey
In other words, the western slope is a tilted peneplain, bearing on its surface remnants of older uplands.
"North America" by Israel C. Russell
A peneplain, therefore, is a surface which has been brought toward, but not to base-level.
"The Geography of the Region about Devils Lake and the Dalles of the Wisconsin" by Rollin D. Salisbury
How may a plain of marine abrasion be expected to differ from a peneplain in its mantle of waste?
"The Elements of Geology" by William Harmon Norton