Perhaps the most well-known ammonite is Dactylioceras commune. This specimen, from the Allum Shales of East Yorkshire, has been sectioned to show the internal chambers.
This belemnite is Hybolites jaculoides. It had a teardrop shaped rostrum. This specimen was collected in East Yorkshire.
Lovenia woodsi (left) is a species of sea urchin from the Miocene of Australia. It is a distinct cardium type species and was found in many world wide locations. It is not dis-similar from the modern day echiocardium cordatum (sea potato).
All species of modern creatures have evolved from ancient ancestors and in this case, the two sea urchins show more similarities in their test (shell) than differences.
Precyclopyge binodosa is a tiny trilobite, a precursor of some very large eyed species. This specimen is sitting in a varved estuarine sediment which makes relative dating easy. This specimen is Llanvirn in age. This is a rare trilobite.
Cnemidopyge bisecta is a typical Welsh ampyxid trilobite, this one was collected from LLandrindod Wells. It has a forward pointing spine (Glabella Spine) which is characteristic of this Ordovician trilobite.
Does a hoverfly that has been compressed onto a sheet of plywood count as a fossil?
These small pyratized ammonites are Ophiceras species from the Jurassic of Ravenscar, North Yorkshire – ord. ref: NZ 977 025