The Land That Time Forgot by Edgar Rice Burroughs

About twenty miles up the coast from the mouth of the river we encountered low cliffs of sandstone, broken and tortured evidence of the great upheaval which had torn Caprona asunder in the past, intermingling upon a common level the rock formations of widely separated eras, fusing some and leaving others untouched.

Tarzan of the Apes by Edgar Rice Burroughs

To be left here alone beside this awful jungle—never to hear a human voice or see a human face—in constant dread of savage beasts and more terribly savage men—a prey to solitude and hopelessness. It was awful.