@article{mit_2005.310, title = {Eight belemnite biohorizons in the Cenomanian of northwest Europe and their importance}, author = {Mitchell, Simon }, year = {2005}, journal = {Geological Journal (John Wiley & Sons) New York}, volume = {40}, pages = {363–382}, url = {https://doi.org/10.1002/gj.1016}, doi = {10.1002/gj.1016} }