Now one lost his footing in the loose shale and slipped back!

The most direct route up to the mine was a treacherous path of loose shale.

If you're buried alive you can live up to a week in the loose shale.

The worst part was the climbing traverse over loose shale up to the cave.

The loose shale would have made the going too slow.

Grabbing pieces from the pile of loose shale they both went into action simultaneously.

A misstep and one was off into loose shale that would start to slide.

He brought up his hands again, but jumped back quickly as a stream of loose shale clattered down from above.

He screamed, fingers digging at the loose shale, finding no purchase.

He walked to the edge of the loose shale and measured in the air with his outstretched hands.