Linear micro-scratches within the grooves of the engraving indicated that it was carved by humans using sharp flint tools to resemble a turtle or tortoise shell. The boulder weighs 4st 6lb (28kg), ...

These punctuation marks should contain the words taken from the text: In A Christmas Carol by Charles Dickens the character of Scrooge is described as being "Hard and sharp as flint".

This artefact would have been larger when it was first made with sharp edges suitable for cutting ... for cleaning animal hides for clothes. This flint is not local to Creswell Crags.