Over the centuries, the fallen rocks have accumlated into a large boulder pile.

The cop with the shepherd came out in front of a boulder pile and said, 'You'd better take a look at this.'

McLeod watched the illuminated track of his vessel on the computer screen, threading through boulder piles.

"Then it's somewhere between the roots and the boulder pile," Takari said.

Were she the one up there, she would be hiding in the dark cavities within the boulder pile, but she was not.

Dens function as houses but are located in rock crevices, rock fissures, and under boulder piles.

Despite the after-effects of a good celebration the group discovered a way up through the massive boulder pile and arrived at the foot of Titan.

This type of lizard lives almost exclusively on rock outcrops, boulder piles, and canyon walls, where it shelters under rocks.

Ulysses gestured toward the boulder pile and Enoch nodded.

In the moonlight the tumbled boulder pile gleamed whitely, like the skeleton of some prehistoric beast.