Although small examples of Ammonites are fairly common in the Chalk Rock (Turonian) of this country, large examples are decidedly rare. The only species of Ammonites as yet recorded from this bed are Prionocyclus neptuni, Geinitz, sp., and Pachydiscus peramplus, Mantell, sp. The former species is always of a small size and is not at all common, but small examples of the latter species, averaging 1½ inches in diameter, are often found, and one large example measuring 8 inches across has been recorded by Mr. H. Woods.