25 miles from Grassington : The Norber Erratics are
glacially-transported sandstone boulders found near
Austwick in North Yorkshire.
They were eroded from cliffs 1km away to the north
in Crummackdale and were deposited at Norber on Carboniferous
limestones when the ice melted about 15000 years ago.
Some of the larger erratics have protected the limestone
beneath them while the surrounding surface has slowly
been dissolved away by acid soil-water.
These erratics now rest on upstanding blocks of limestone,
known as pedestals, some of which reach 60cm in height.
