Carreg yr Imbill is the remains of a large

dolerite Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grained ...

with pegmatite pods and quarry at

Pwllheli Pwllheli () is a market town and community of the Llŷn Peninsula ( cy, Penrhyn Llŷn) in Gwynedd, north-western Wales. It had a population of 4,076 in 2011 of whom a large proportion, 81%, are Welsh language, Welsh speaking. Pwllheli is the pl ...

Gwynedd Gwynedd (; ) is a county and preserved county (latter with differing boundaries; includes the Isle of Anglesey) in the north-west of Wales. It shares borders with Powys, Conwy County Borough, Denbighshire, Anglesey over the Menai Strait, and C ...

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 ...

. The dolerite was mined by the

Liverpool and Pwllheli Granite Company Liverpool is a City status in the United Kingdom, city and metropolitan borough in Merseyside, England. With a population of in 2019, it is the List of English districts by population, 10th largest English district by population and its E ...

(sometimes known as the Pwllheli Granite Company), which used the diorite for stone setts to pave the streets. The worked out quarry forms the basis for a large

holiday village A holiday village (also abbreviated HV) is a holiday resort where the visitors stay in villas. There is a central area with shops, entertainment, and other amenities. One example is Center Parcs Center Parcs may refer to: * Center Parcs UK and ...

which is run by the Haulfryn Group, the same company which runs

The Warren The Warren, originally known as Warren House, is a Grade II listed building located in the parish of West Wickham and the postal district of Hayes, Greater London, England. Built in 1882 by Walter Maximilian de Zoete, the manor house is known for i ...

in Abersoch.

References

Pwllheli Quarries in Gwynedd Rock formations of Gwynedd {{Gwynedd-geo-stub