Jacobi Zone Research Articles

Problems of Ammonite Nomenclature. 5. On Acanthohoplites jacobi (Collet) and the jacobi zone of the Folkestone Sands

This note is prompted by the recent discovery (by Mr. R. Casey) of ammonites of the jacobi zone at the base of the Folkestone Sands.1 These ammonites include A. jacobi itself and since, more-over, the jacobi zone is likely to be much quoted, it seems particularly desirable to inquire whether the name jacobi can be safely used.