The path indeed led straight ahead and slightly down, with the same lines of high natural walls as before; but on the left hand there opened out a monstrous space, vast acres in extent, where some archaic power had riven and rent the native cliffs of onyx in the form of a giant's quarry. Far back into the solid precipice ran that cyclopean gouge, and deep down within earth's bowels its lower delvings yawned. It was no quarry of man, and the concave sides were scarred with great squares, yards wide, which told of the size of the blocks once hewn by nameless hands and chisels. High over its jagged rim huge ravens flapped and croaked, and vague whirrings in the unseen depths told of bats or urhags or less mentionable presences haunting the endless blackness. There Carter stood in the narrow way amidst the twilight with the rocky path sloping down before him; tall onyx cliffs on his right that led on as far as he could see and tall cliffs on the left chopped off just ahead to make that terrible and unearthly quarry.