form

process

rates of erosion

inheritance

raised beach

Key sites

Belhaven

Chapel Point

The Gegan

A raised shore platform developed on horizontally-bedded limestone at Chapel Point

 

 

Raised rock platforms

Definition: a former shore platform standing above present sea level

Since the retreat of the last ice sheet sea level on the east Lothian coast has varied from +25 m during ice retreat to  ~-15 m during the Lateglacial and from 10-1 m over the last 7000 years. Beaches were deposited and reworked during periods of relatively stable sea level and later raised above present sea level. At least some of these beaches rest on fragments of raised shore platform.

The most obvious raised platform is that on which the Main Postglacial Raised Beach rests. At the present limit of wave action this platform stands around 2 m above sea level. It has an impressive extent, locally as at Dunbar Golf Course extending 300 m inland to a backing cliff. In places, remnants of this platform form extensive elements of the current inter-tidal shore platform.

Higher raised postglacial shore platforms may exist but have yet to be demonstrated. It seems certain however that fragments of high platforms exist which were cut before the advance of the last ice sheet. These inherited elements are prominent at Berwick-on-Tweed and around Dunbar. The low rock platforms also retain small segments near the limit of wave attack which retain a cover of till or show striated surfaces.