9 - Benllech - Menai Bridge
Sandstone Pipe
As the Path approaches the headland Trwyn Dwlban walk along the beach to see the next few photos.
Red Wharf Bay is famous for its Sandstone Pipes
- cylinders of brown Sandstone protruding down into pot-holed Limestone.
Around 330 MYA, an ancient Ice Age caused the sea level to fall exposing Limestone to
weathering and river erosion creating solution hollows (pot holes) .
When the sea level rose again, the pot-holed Limestone was buried in sand.
Erosion is now leaving the tops of Sandstone Pipes standing above the Limestone.
Ref: NW 1973
Date: 15/04/2023
Location: SH 5324 8190
