Article: Fossils from the Middle–Upper Cambrian transition in the Nuneaton district
In Britain the Middle-Upper Cambrian transition is fossiliferous only in the Nuneaton district. The Lejopyge laevigata Zone (Middle Cambrian) is recognized by a sparse fauna, chiefly of agnostid trilobites of Scandinavian character. The Agnostus pisiformis Zone (Upper Cambrian) contains Scandinavian agnostids and bradoriid Crustacea and also agnostids known from North America and Siberia, and rare polymerid trilobites akin to forms from Asia, Australia, and the U.S.A. Cristagnostus papilio gen. et sp. nov. and Modocia anglica sp. nov. are described.