Lyme Regis crustacean fossil- Which stratum would this originate from?

[Paleoworld-101]

This fossil crustacean was collected in England on the foreshore between Lyme Regis and Charmouth, amongst the algae-covered large boulders that are exposed at low tide. It looks to be in some kind of phosphatic nodule. The cream-colour of the matrix is quite unlike the dark Jurassic rocks that make this region famous. I was thinking it is unlikely to be from the Jurassic layers, and probably originates from the overlying Cretaceous sequences higher up in the cliffs? Both Gault Clay and Upper Greensand (Albian in age) unconformably sit above the Jurassic beds. Does anyone know which of these deposits are known to produce crustacean specimens with this type of preservation and lithology in the Lyme Regis area? Thanks for any input!

 

 

[TqB]

The colour looks right for the "cowstones" from the  Upper Greensand (indurated boulders that are abundant at that location) which frequently contain the lobster Hoploparia longimana.

[Paleoworld-101]

1 hour ago, TqB said:

The colour looks right for the "cowstones" from the  Upper Greensand (indurated boulders that are abundant at that location) which frequently contain the lobster Hoploparia longimana.

 

Thanks for the super fast response! This is great to know. Upper Greensand does make the most sense. Cheers!