Phil Bennett, NPA culture and heritage manager, said: "The storms and high seas have pushed the pebble bank back and scoured the sand, exposing the remains of this woodland. We have been able to identify some recognisable timbers from the Mesolithic period.
"Ten thousand years ago this woodland area would have been visited by hunter gatherer bands from time to time, looking for game and collecting edible plants, nuts and berries as these resources became available during the year."
Council workers are now covering the most vulnerable parts of the forest with pebbles, as extended exposure to the sun will dry it out and it will be lost.
Pembrokeshire County Council has withdrawn mince from its menus after being told a batch of frozen minced beef has potentially tested positive for horsemeat.
The mince was supplied by Welsh Bros Foods of Newport, Gwent, and was used by the council for schools, day centres and residential homes.
The council says it has also been made aware that frozen beef products supplied to Sodexo – a company providing catering services to the authority's privately-financed initiative school in Pembroke Dock – has tested positive for horsemeat.
Sodexo has withdrawn all frozen beef products from its UK catering operations.
The commanding officer of Ranger Michael Maguire, who was killed this week in Pembrokeshire during a live-firing exercise has paid tribute to him.
Major Richard Bell, Ranger Maguire's company commander, said:
One of our very best, his loss has devastated everyone who knew him.
Michael was always going to stand out from the crowd. Not only because he stood a towering 6ft 7in tall, but because of his vastly cheerful outlook on life, natural charisma and irrepressible good humour.
All of this ensured that he was extremely popular throughout the company and his loss is keenly felt.