High Road Leyton, London, E10. Photo ©RogerDean 2014
Curiosities Of London Exhibiting The Most Rare And Remarkable Objects Of Interest In The Metropolis; With Nearly Sixty Years Personal Recollections – John Timbs, 1867:
Fossils are occasionally found on the rising slopes near Holloway, formed by the earth thrown up in 1812, when the Highgate tunnel was made. Fine specimens of echinus marinus (sea urchin) have been picked up in a field contiguous to the archway, together with a fish resembling a sole; [...].