The ammonite into the middle of the slab has a huge lappet.

Names : Reineckeia + Hecticoceras + Choffatia + Brachiopods
Age : Jurassic , Callovian
Findspot : Niort , France

The slab measures 72 x 27 cm which is big and has a weight of 27.5 kg. The biggest ammonite has a size of 13.2 cm. No ammonite has been added nor reglued .The slab is as found.
Note the good contrast between fossils and the white stone.