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trace fossil
Gravel Bay
Moor Cliffs Formation

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Gravel Bay - millipede-like burrows in Moor Cliffs Formation sandstone

Gravel Bay - millipede-like burrows in Moor Cliffs Formation sandstone
Freshwater West, Gravel Bay and East Pickard Bay

Moor Cliffs Formation in Gravel Bay.

This photo shows a close-up view of the light purple sandstone bed with greenish laminae seen in the previous photo. The darker perpendicular features in the sandstone are trace-fossil Beaconites burrows. Having previously been tentatively ascribed to worm burrows or lung-fish burrows, they are now thought to have been made by primitive millipede-like animals.

The bed is approx. 50 cm thick (top to bottom) in this photo.

The Moor Cliffs Formation overlies the Freshwater East conglomerates, seen in previous photos, and spans the boundary between the Silurian and Devonian periods. It consists of red mudstones and siltstones with occasional thin sandstone beds. These were deposited on a low-reflief floodplain at the edge of an arid continental margin, the sandstones being deposited by seasonal braided streams, the muds and silts deposited in ephemeral marginal lakes. When not inundated, the muds and silts developed carbonate-rich calcrete (caliche) soil horizons along dessication cracks, burrows and early plant root systems.

 Amelia Heath
Amelia Heath club
It is amazing what you find in rock formations. That greenish band in the sandstone is striking.
11 months ago.
Earthwatcher club
has replied to Amelia Heath club
Thanks, Amelia!
The Old Red Sandstone coast in Pembrokeshire has some beautiful colours. Lots of reddish browns, as you might expect, but also whites and greens as you have commented.
11 months ago.

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