Portuguese gastropods ID needed

[mediterranic]

Hello guys.

These gigantic gastropods (?) were found 30 years ago near Lisbon. In a dry river. Not too much geological information to provide. The green mineral was found adjacent to the specimens. The three specimens where meters apart ones from the others. They have a brown/orange/white mineral associated in some parts.

 

Can anyone help with the ID, please?

 

Thanks in advance,

Miguel

 

P.S.: the Calymenid is just part of the same collection and it is, of course, from Morocco. No relation with the other fossils.

[Spinosaurus]

you have some nice fossils 

but i dont know how to id these shells

[mediterranic]

Just now, Spinosaurus said:

you have some nice fossils

Thanks @Spinosaurus. The problem with these is that I have no idea what they are :-)

 

[ynot]

Can not help with the snails, but the "green mineral" is tourmaline.

[Wrangellian]

Cripes... fossils and gems/minerals in one collecting site. What more could one ask for?

 

Can you narrow down the geologic info, at least? Are they Cenozoic? Were there any other fossils found in the same rock, and if so, what are they?

[coled18]

They look like Lunatia Gastropods, a genus of predatory snail that lived primarily in the Cretaceous (there are still a few alive today). You also have a nice trilobite in the 7th picture. If you want my guess on what species they are I would say some might be Lunatia Pedernalis. 

[Herb]

Looks sort of like Tylostoma sp. a Cretaceous gastropod

[mediterranic]

Dear colleagues, thanks for your opinions. In fact, these will need a detective work to know something more than can help in a further or more consistent ID. Even like that, your opinions were precious to have an idea of what they can be.

Will return to it if I discover something more about the history of their find. 

[Herb]

These are Tylostoma sp. From the Cretaceous Goodland Form. of Ft.Worth, TX