<P> Fossil trading is the practice of buying and selling fossils . This is many times done illegally with artifacts stolen from research sites, costing many important scientific specimens each year . The problem is quite pronounced in China, where many specimens have been stolen . </P> <P> Fossil collecting (some times, in a non-scientific sense, fossil hunting) is the collection of fossils for scientific study, hobby, or profit . Fossil collecting, as practiced by amateurs, is the predecessor of modern paleontology and many still collect fossils and study fossils as amateurs . Professionals and amateurs alike collect fossils for their scientific value . </P> <Ul> <Li> <P> Three small ammonite fossils, each approximately 1.5 cm across </P> </Li> <Li> <P> Eocene fossil fish Priscacara liops from the Green River Formation of Wyoming </P> </Li> <Li> <P> A permineralized trilobite, Asaphus kowalewskii </P> </Li> <Li> <P> Megalodon and Carcharodontosaurus teeth . The latter was found in the Sahara Desert . </P> </Li> <Li> <P> Fossil shrimp (Cretaceous) </P> </Li> <Li> <P> Petrified softwood </P> </Li> <Li> <P> Petrified cone of Araucaria mirabilis from Patagonia, Argentina dating from the Jurassic Period (approx. 210 Ma) </P> </Li> <Li> <P> A fossil gastropod from the Pliocene of Cyprus . A serpulid worm is attached . </P> </Li> <Li> <P> Silurian Orthoceras fossil </P> </Li> <Li> <P> Eocene fossil flower, collected August 2010 from Clare family fossil quarry, Florissant, Colorado </P> </Li> <Li> <P> A fairy loaf fossil, which is one of the most found fossils in the UK </P> </Li> <Li> <P> Productid brachiopod ventral valve; Roadian, Guadalupian (Middle Permian); Glass Mountains, Texas . </P> </Li> <Li> <P> Agatized coral from the Hawthorn Group (Oligocene--Miocene), Florida . An example of preservation by replacement . </P> </Li> <Li> <P> Fossils from beaches of the Baltic Sea island of Gotland, placed on paper with 7 mm (0.28 inch) squares . </P> </Li> </Ul> <Li> <P> Three small ammonite fossils, each approximately 1.5 cm across </P> </Li>

Give examples of the types of fossils formed through permineralization and carbonization