Many of the cliffs were composed of a light-coloured marl; but the formation is chiefly old arenaceous rocks.
"Discoveries in Australia, Volume 1." by J Lort Stokes
ARENACEOUS ROCKS include all sediments in which quartz sand is the most important constituent.
"The New Gresham Encyclopedia. Vol. 1 Part 2" by Various
Arenaceous rocks described, 11.
"A Manual of Elementary Geology" by Charles Lyell