The Louth Stone -- one of the larger erratics described by Caitlin Green
This is an interesting study of the "bluestones" of eastern England -- particularly Lincolnshire and Norfolk. The author looks at a group of glacial erratic boulders -- widely scattered, with all the characters of large glacially transported clasts including facets, abraded edges etc. It's a nice study, concentrating on the questions of what the stones were used for and why they were called BLUEstones when many of them are not blue at all. It would have been nice if Caitlin had investigated the sources of the bluestones, but there you go.........
The erratic in the photo is reputed to have come from the Whin Sill.
https://www.caitlingreen.org/2021/02/lincolnshire-bluestones.html#fn5
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