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Such fossils often become part of museum or university collections.Many other fossils, however, are collected by hobbyists and commercial entities.In recent years, geologists have been able to study the subsurface stratigraphy of oil and natural gas deposits by analyzing microfossils obtained from core samples of deep borings.Fossil collection as performed by paleontologists, geologists, and other scientists typically involves a rigorous excavation and documentation process.Solutions may fill the interstices, or pores, of the shell or bone with calcium carbonate or other mineral salts and thus fossilize the remains, in a process known as permineralization.In other cases there may be a total replacement of the original skeletal material by other mineral matter, a process known as mineralization, or replacement.In such sequences of layers in different geographic locations, the same, or similar, fossil floras or faunas occur in the identical order.
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It is often apparent that each layer in such a sequence contains fossils that are distinct from those of the layers that are above and below it.
The chemical reduction of the part produces a carbon film that occurs on one layer of rock, while an impression of that part occurs on the other layer of the rock.
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