Bergamia prima (Elles, 1940).
Black shale. on one surface clustered together are the remains of 12 Trinucleid Trilobites. .Most lying one on top of the other. All drifted together on death by currents on the se bed. One of the specimen is complete. Nice detail under magnification.
Ordovician, Uppermost Llanvirn Series, 'Llandeilian 'Stage, Llanfawr Mudstone Formation.
Maesgwynne near Builth Wells, Powys, Wales.
Matrix : 9.5 x 4.5 cm.
