Cardiocardita

There are many types of bivalve shells found in the Barton Beds.  Cardiocardita sulcata is one of the common forms.  This clam is identical to forms found on modern beaches.

Worm Tubes

Ditrupa bartonensis is a fossil Serpulid worm tube from Barton-on-Sea, Hampshire.  The worm would have secreted the material to make the tube around its body.  These were filter feeding worms which extended filter plumes above the vertically orientated tubes, buried in the sediment surface.

Dactylioceras

This tiny ammonite from the Jurassic shales at Holwell near Melton Mowbray has a form like Dactylioceras.  It is likely to be a juvenile of that genus.

Barrosia

This large Bryozoan is Barrosia irregularis.  It was collected from the Farringdon Sponge Gravels in Berkshire, UK.  There is also a fish which bears the name Barrosia, so there is doubt about how the classification should be applied.  The bryozoan was named first, so that should taker precedence.  The fish is identical to an earlier named species, Calloplesiops and should take that name.  This type of naming dilemma is occasionally an issue with fossils.

Isastraea

The limestone rocks in Gloucestershire have yielded this Jurassic coral.  It shows a domed colony of Isastraea limitata which has been sectioned and polished to show the internal arrangement of corals.

Clissophyllum

 

The limestones near Matlock, Derbyshire contain many fossil coral reefs of Carboniferous age, suggesting that the UK had a tropical climate in the distant past.  This specimen was initially identified as Clissophyllum species, but I have doubts about the validity of the classification.

Murchisonia

These tiny specimens are just 5 and 6 mm long.  They are small gastropods of Murchisonia species.  There is not enough material to give a specific species.  They came from the Oxford Clay near Peterborough (ref: TL 197957) and they are an unusual find in these deep marine sediments.