The sedimentary rocks of the Arisaig Group begin at the Point and continue toward McAras Brook. Most of these rocks are siltstones and sandstones with uncommon shales. Almost all show an abundance of fossils. This rock unit consists of dark grey shale and siltstone composed of small particles of mud and silt. Cliffs on the east side of the park expose dark grey shale layers but very few fossils.
Some fossils are visible in the rock while others can only be found after a careful search.
Most fossils can easily be found by splitting open rock layers from the beach.