You've got to love Roach Stone - it's a facies (variety) of the famous Portland Stone (a Jurassic limestone) that many of the public buildings in London are built from. Christopher Wren made Portland Stone famous when he used it to build the new St Paul's Cathedral in London after the Great Fire. OK, so he had shares in the quarry...

The stone is full of fossil shells - the pointy ones are the famous 'Portland Screws'.

#Geology #UrbanGeology #Limestone #PortlandStone #RoachStone #Jurassic #ChristopherWren #FossilFriday