York topographic maps

Average elevation: 15 m

Average elevation: 16 m

Average elevation: 15 m

Average elevation: 22 m

Average elevation: 15 m

Average elevation: 22 m

Average elevation: 17 m

Average elevation: 21 m

Average elevation: 27 m

Average elevation: 16 m

Average elevation: 15 m

Average elevation: 17 m

Average elevation: 15 m

However, subsequent colonization by common reed, whose fossilized root fragments have been found immediately above the nekron mud layer, lead to a reduced extent of open water. In turn, a layer of fen peat gradually accumulated above the mud in the bog centre to begin forming a raised bog. The increased…

Average elevation: 16 m

Average elevation: 12 m

Average elevation: 17 m

Average elevation: 18 m

Average elevation: 12 m

Average elevation: 11 m

Average elevation: 15 m

Average elevation: 18 m

Average elevation: 16 m

Average elevation: 15 m

Average elevation: 10 m

Average elevation: 10 m

Average elevation: 16 m