sentences:  The supposed stone, which is an erratic from the Ice Age, is now kept at Blakesley Hall in Yardley.Gilbertstone was shown as a separate entity to Yardley in John Ogilby's strip map of Coventry Road.Gilbertstone developed as a result of the construction of the now-demolished Gilbertstone House, which was built between 1866 and 1867 for Samuel Thornley, on the site of a small farmhouse.