Image credit Bozzer

“…I have ascertained that Silbury Hill was originally surrounded by a deep trench or moat. Also, that it was erected by a people, probably a rude race of hunters, so little advanced in civilisation that they were using flint implements a long time after the hill was built. This discovery places the date of the erection of Silbury Hill at a very early period, possibly many centuries before the arrival of the Romans in Britain.”

From Recent Excavations at Silbury Hill  by Alfred C. Pass (he should have gone to Specsavers 😉 and read to the Clifton Antiquarian Club on 15 December 1886. See – http://www.google.com/url?sa=X&q=http://silburyhill.pagesperso-orange.fr/silbury-hill-archeology/Recent-excavations-at-Silbury-Hill.pdf&ct=ga&cad=CAcQARgAIAEoBDAAOABAnYqm6QRIAVgAYgJlbg&cd=9hUDtIABgWY&usg=AFQjCNFNaTHeQyCboLzwaNygOiBSLyAIUw