Geology Seminar 19 - The Brachiopods

A seventh Seminar on Palaeontology looking at a fifth group of fossils, the Brachiopods.  These are a group of twin shelled marine organisms which were common in the Palaeozoic Era but declined during the Mesozoic Era until becoming rare in the present day as a result of competition with more successful life forms and no doubt climatic change.  Good indicators in the fossil record of shallow marine tropical conditions and intolerant of pollution in the present day.