The sides slope steeply in parts, in many places are quite perpendicular or over-hanging, the walls being the usual hard, marly clay, while I noticed broad layers of conglomerate and sandstone also occur.
"The Incomparable 29th and the "River Clyde""
George Davidson
The Engineers have sunk a well in a marly part near this, but the earth they are throwing up is perfectly dry, and they might as well give it up.
"The Incomparable 29th and the "River Clyde""
George Davidson
A moderately firm surface is necessary for the machine to run along the ground; if the ground be soft or marly the wheels would sink in the soil, and serious accidents have resulted from the sudden stoppage of the forward motion due to this cause.
"The Mastery of the Air"
William J. Claxton