Quotation from: Out of Time's Abyss

Written by: Edgar Rice Burroughs

But there was little sleep in camp that night until utter
exhaustion overtook the harassed men toward morning; nor was
there any return of the weird creature that had set the nerves of
each of them on edge.

The following forenoon the party reached the base of the barrier
cliffs and for two days marched northward in an effort to
discover a break in the frowning abutment that raised its rocky
face almost perpendicularly above them, yet nowhere was there the
slightest indication that the cliffs were scalable.