On the top of the cliff between Headon Hill and Widdick Chine, in Totland Bay, there is a Recent tufaceous deposit containing land and fresh-water shells. It extends along the cliff for nearly 350 yards in a north-easterly direction from the base of Headon Hill, and is about 60 feet above the sea-level.
It was first described by Mr. Joshua Trimmer, and subsequently by Professor Edward Forbes and Mr. H. W. Bristow. In the more recent memoir on the Isle of Wight the earlier descriptions are quoted, but the section is described as being then almost entirely overgrown.