jurassic strata in cliffs

footprint ammonitic geological ammonites extinction excavation paleolithic tyrannosaurus archaeologist ancient dinosaur skeleton evolution museum stone archeology petrified mineral extinct fossilized prehistoric fossil paleontology crinoids coccolithophores brachiopods bivalves belemnite ammonite palaeoecology hunting orcombe point landscape erosion beach britain coast coastal cliff craggy limestone budleigh salterton exmouth jurassic geology strata sandstone rocks fossils