Nolton Haven channel lag deposit in beach boulder 2

Nolton Haven to Newgale
The small Nolton-Newgale coalfield is separated by faulting from the main Pembrokeshire coalfield. It lies mostly within Pennant Sandstone Formation of the Upper Coal Measures rocks.

The cliffs of Nolton Haven expose predominantly deltaic channel sandstones, often with highly erosive bases with coarse, rip-up, channel-lag deposits. The general dip is around 20° to the south-west.

This photo shows a cross-section view of a locally derived beach boulder consisting of a channel lag deposit with ironstone pebbles and fragments set in a pale grey coarse sandstone matrix. The boulder is approx. 50 cm thick.