French to English Tech/Engineering Geology Types of Rock

Immediate context: On parle de pierre coquillière si elle contient des coquillages fossiles

(elle referring to la pierre)

This is a chapter on stone for a text book on materials.

I have translated it as "The term coquina is used for rock containing fossilised shells"

But just wanted to check that 'coquina' is the correct term, as my reference only describes it as containing fragmented shells and not fossilised...