Date and Time
Sully, Penarth CF64 5UG
Field Trip Description
The Triassic rocks near Sully and Penarth (50 miles west of Bristol), near Cardiff, were deposited around the edge of a lake or inland sea in which the Mercia Mudstone/ Keuper Marl was deposited. The Trias overlies the Carboniferous limestone which locally created hills and cliffs around the lake; wave-cut shore-platforms and wave-notches were cut into the limestone cliffs, and screes of Carb Lst debris were formed, locally reworked into beach gravel breccias. A range of shoreline limestones was developed – with stromatolites, ripples, tepees, birdseyes, and these are interbedded with soils (calcretes) and evaporites, mostly gypsum-anhydrite, since replaced by dolomite and quartz. Dinosaur footprints are also present in the muddy marginal lacustrine sediments.
The day is dependent on the tides and we shall visit Swanbridge, Sully Island, Bendrick Rock and Lavernock Point.
We will travel in private cars for this excursion and hopefully car-sharing can be arranged.
Meeting point will be the public car-park at Swanbridge, near the Captain’s Wife pub (postcode CF64 5UG), opposite Sully Island.
Travel via the M4 to junction 33, then head south towards Barry on the A4232, A4050, A4231 and B4267 through Sully to Swanbridge. AA Route planner suggests 1 hr 30 mins and ~65 miles from Bath.
Rendezvous at 10.30 am.
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