It evidently was the sea-water filtered through the soft rock.
It is composed of soft rock, and is several hundred feet high.
Also there was the Court House Rock, called that because of the rooms in it as if someone had cut rooms into the soft rock.
The alternating bands of hard and soft rock have had a large part in making the course more irregular.
Off to one side another man was drilling holes in the soft rock.
It had been a little too long to lie flat, but its summit of soft rock was struck off with the fall.
A glance showed him that the stone of baby Day's tablet yet held firm, cemented in the niche of the soft rock.
Even foot-paths, by constant use, were sunk four or five feet deep in the soft rock.
And to-day when my pick hit what felt like a soft rock—I looked and saw the gleam of gold!
For five hundred miles of this distance, the river has worn deep cuts or gorges through the soft rock, called cañons.