The floor is false, for one thing, a deep pit filled with soft dust.

He'd been so busy he'd not heard the mare coming in that soft dust.

In the soft dust beside the door, she saw two distinct sets of footprints.

The soft dust clearly bore the imprint of her body.

The places you're seeing tracks, that's where he was crossing softer dust.

They slowed for the rise, moving their feet in the deep soft dust, feeling the earth with their feet.

Also, there were sinister tracks in the soft red dust.

Stroud had hesitated an instant only, then he walked through the soft dust toward Pike.

He stepped forward deliberately, his immense feet sinking into the soft dust.

My horse made no sound in the soft dust of the trail.