I'm not sure how I came by this link about Coprolite or why it has taken such a long time to find, but since it pertains to Coprolite and the village of Bassingbourn, Cambridgeshire, I thought I should record it here. My line of JACKLIN's originate from this area; the England and Wales Census 1871 records my great great grandfather Daniel JACKLIN 1842-1897's occupation as 'Coprolite labourer'.
Wikipedia also has an entry for Coprolite.
2016-11-28 Another very good article about Coprolite: The Coprolite Industry in Meldreth. Meldreth is just a few miles from Orwell and Whaddon where my JACKLIN and PEARCE lines originate.