If you travel south you will get to an area which could be called a "shingle" beach, because all the rocks here are very flat. This beach was built in the last 10 years and is composed mostly of dolostone rocks and chips again from the deep tunnel project. There are several headlands or rock piles at ether end to protect the beach from large waves.
If you walk from the sidewalk near the road toward the beach you will get to a steep drop off not far from the beach.
This is the limits of the wave activity and you can see the exposed "bed rock" which is made of the dolostone chips.
As you travel farther toward the water you will note the stones get rounder and smoother.
Eventually these stones will be dissolved. This is a great beach for skipping stones when there is quiet water. The sand that is present has been washed in from other areas to the north or south.