The site of a prehistoric settlement and quern production site was excavated in 1964 at Helwith Bridge in Ribblesdale. At least a dozen rotary quern stones were found. The querns were made from millstone grit washed out as boulders from the local glacial drift by streams. From pottery found and the types of quern produced it seems likely that the site was in use some time during the late Iron Age and Roman periods.
King, Alan (1970) Early Pennine Settlement. Clapham: Dalesman
Walker, W H & King, A (1965) ‘Helwith Bridge, W R’ Yorkshire Archaeological Journal. Vol 41 p325