GWYNEDD Archaeological Trust is once again conducting excavation work at Dinas Dinlle prehistoric coastal hillfort.

This time, it is focussing its attention on the remains of the well-preserved remains of the large Iron Age roundhouse, on the western side of the hillfort interior.

The project, which began on July 11 and lasts until August 5, is funded by and in collaboration with Cadw, the National Trust and the CHERISH project.

Volunteers, school children and Bangor University students are helping with the work.

The fort is falling into the sea, and the roundhouse remains it will be investigating are situated on the side of the hillfort that is most at risk from erosion.

Dinas Dinlle coastal hillfort is set in a dramatic location overlooking the sea and north Llŷn coastal plain.

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Gwynedd Archaeological Trust resumes excavating at Gwynedd hillfort

The defences and interior buildings are thought to have been first constructed in the late prehistoric period, but occupation, confirmed by finds of pottery, continued into the Roman period.

In the early 20th century, the fort formed part of a golf course, while during World War II, defences were constructed on the northern slopes to protect nearby RAF Llandwrog – now Caernarfon airport.

The fort is owned by the National Trust, protected as a Scheduled Monument, and the hill of glacial sediments on which the site sits is a geological Site of Special Scientific Interest.