15.5 cm Microderoceras ammonite bed, from Charmouth beach

Microderoceras and Cymbites ammonites measuring 15.5 cm across, including the matrix.
 
The matrix has been repaired after being broken when found. 
The piece originates from the Birchi nodule bed. 
 
Lower Sinemurian, Black Ven Mudstone Member, Charmouth Mudstone Formation, Charmouth, Dorset. 195 MYA