Rocks deposited during the life-span of one particular species. Related Articles: Encrinus liliiformis: A crinoid from the Triassic that made a career for itself: Germany’s fossil of the year, 2019The geology and fossils of the Burnham Chalk Formation (Upper Cretaceous) of North Ormsby, LincolnshireProboscidean tusks through time: A special case of excavation and displaying experienceAnother day at the office: Working as a wellsite geologist in the North Sea: a short summary« Back to Glossary Index