View of the northwestern part of the Thornton Quarry; red boxes on quarry floor are about 2 m high. Closely-spaced, light-colored vertical lines are drillholes. Left to right inclination of flank beds is also visible.
Inclined flank beds of the reef overlying nearly horizontal pre-reef deposits. As at Racine, flank beds contain abundant crinoid debris. Note pick-up truck for scale.
A large, dark-colored boulder within flank beds. Boulders were emplaced by sliding down the flank of the reef. They contain abundant corals and stromatoporoids and were derived from the reef crest.