Gilwern Hill is a hill about 3 mi / 5 km southeast of Llandrindod Wells in the county of Powys,

Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...

Geology

The hill is composed from a range of lower and middle Ordovician volcaniclastic rocks which form a part of the Builth Inlier.

Palaeontologist Paleontology (), also spelled palaeontology or palæontology, is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene epoch (roughly 11,700 years before present). It includes the study of fossi ...

s Pete Lawrance and Brian Beveridge have spent 30 years examining fossils from a privately owned limestone quarry on the hill. Amongst fossils so far identified at this location are the

trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At ...

Meadowtownella ''Meadowtownella'' is a rare genus of odontopleurid trilobite found in Ordovician rocks. It is similar to '' Acidaspis cincinnatiensis'' but without the occipital spine. Some species have been found in Gilwern Hill in Wales, but tend only to b ...

Bettonolithus Bettonolithus is a genus of trilobites of the Order Asaphida. It is in the family Trinucleidae. Fossil specimens have been found in the Lower Ordovician rocks of Gilwern Hill in Powys, Wales. Anatomical evidence suggests this Trilobite sifted ...

, Protolloydolithus and

Anebolithus ''Anebolithus'' is a genus of trilobites found in Gilwern Hill, Powys, Wales Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, ...

together with

Conulariida Conulariida is a poorly understood fossil group that has possible affinity with the Cnidaria. Their exact position as a taxon of extinct medusozoan cnidarians is highly speculative. Members of the Conulariida are commonly referred to as conularii ...

Iocrinus ''Iocrinus'' is an extinct genus of crinoid (sea lilies and feather stars). It is an early Form (zoology), form of crinoid, from the Ordovician Rock (geology), rock of North America, England, and Gilwern Hill, Powys in Wales. Selected species ...

, Clonograptus and

starfish Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea (). Common usage frequently finds these names being also applied to ophiuroids, which are correctly referred to as brittle stars or basket stars. Starfish ...

Stone rows

There are two prehistoric

stone row A stone row or stone alignment is a linear arrangement of upright, parallel megalithic standing stones set at intervals along a common axis or series of axes, usually dating from the later Neolithic or Bronze Age.Power (1997), p.23 Rows may be in ...

s at the southern end of the hill, each with a large stone, more than 2m high, at one end.

References

{{coord, 52, 12, N, 3, 20, W, display=title, region:GB_type:mountain_source:GNS-enwiki Paleontological sites of Europe Prehistoric sites in Wales Mountains and hills of Powys