Druidston Bay has the only well exposed Ordovician Rocks that show the effects of the
Caledonian (400MYA) & Variscan (290MYA) , Mountain Building Periods (Orogeny).
The Black Shales , in the Ordovician Cliffs at the back of Druidston Beach have been
contorted by complex folds and faults.
The cliffs exhibit the superimposition of Variscan Structures onto earlier
Caledonian Structures.
Further to the north passed the pebble bank , is another Ordovician Black Cliff with
folds and faults from the Caledonian Orogeny.
Both Cliffs are part of the same Structure , called a "Horst" , which was uplifted during
the Caledonian Orogeny and intrudes into the "Coal Measure" rocks
that form this part of the coast.
The North and South Cliffs are the limbs of an Anticline , where the central section
has been eroded away to form the beach .
Ref: 11202
Date: 17/11/2013
Location: SM 8609.1702
