Cretaceous? 1-Oysters?; 2-bivalve; A.3,4-turitellid? gastropods...
Allen A.
1. gastropods and probable bivalves, unidentifiable ; 2.decalcified
thickshelled bivalve with deeply-impressed muscle-scars (NOT a cucullaeid,
which has thickened muscle-scars); ; 3&4 - high-spired gastropod,
not Turritellidae, probably Cerithoiodea ... Andrew G.