amphibians: The class of vertebrates that contains the frogs, toads, newts, and salamanders.The amphibians evolved in the Devonian period (about 370 million years ago) as the first vertebrates to occupy the land.
Species adapt when succeeding generations emphasize beneficial characteristics.
amino acid sequence: A series of amino acids, the building blocks of proteins, usually coded for by DNA.
Exceptions are those coded for by the RNA of certain viruses, such as HIV.
Right: A crushed ammonite from the Shales-with-Beef Member, found on the foreshore beneath Black Ven.
Left: A large nautilus in cross-section on the surface of a foreshore boulder at Monmouth Beach, beneath Ware Cliffs. Norman Mac Leod and Dr Paul Davis at the Natural History Museum of London for their continued support and guidance identifying the stratigraphy of Black Ven and Church Cliffs.