A coprolite (also known as a coprolith) is feces. Coprolites are classified as as opposed to body fossils, as they give evidence for the animal's behaviour (in this case, diet) rather than morphology. The name is derived from the Ancient Greek words κόπρος ( kopros, meaning "dung") and λίθος ( lithos, meaning "stone"). They were first described by William Buckland in 1829. Before this, they were known as "fossil fir cones" and "bezoar stones". They serve a valuable purpose in paleontology because they provide direct evidence of the predation and diet of extinct organisms.
Coprolites, distinct from paleofeces, are fossilized animal dung. Like other fossils, coprolites have had much of their original composition replaced by mineral deposits such as and calcium carbonates. Paleofeces, on the other hand, retain much of their original organic composition and can be reconstituted to determine their original chemical properties, though in practice the term coprolite is also used for ancient human fecal material in archaeological contexts.
Initial discovery
British fossil hunter
Mary Anning noticed as early as 1824 that "
Bezoar" were often found in the abdominal region of
ichthyosaur skeletons found in the
Lias Group formation at
Lyme Regis.
She also noted that if such stones were broken open they often contained fossilized fish bones and scales as well as sometimes bones from smaller ichthyosaurs. These observations by Anning led the geologist William Buckland to propose in 1829 that the stones were fossilized
feces and to name them coprolites. Buckland also suspected that the spiral markings on the fossils indicated that ichthyosaurs had spiral ridges in their intestines similar to those of modern sharks and that some of these coprolites were black with ink from swallowed
.
[Rudwick, Martin Worlds Before Adam: The Reconstruction of Geohistory in the Age of Reform pp. 154-155.]
Research value
By examining coprolites,
Paleontology are able to find information about the diet of the animal (if bones or other food remains are present), such as whether it was a
herbivore or a
carnivore, and the
taphonomy of the coprolites, although the producer is rarely identified unambiguously,
especially with more ancient examples.
In some instances, knowledge about the anatomy of animals' digestive tracts can be helpful in assigning a coprolite to the animal that produced it, one example being the finding that the
Triassic Dinosauriformes Silesaurus may have been an insectivore, a suggestion which was based on the beak-like jaws of the animal and the high density of beetle remains found in associated coprolites.
Further, coprolites can be analyzed for certain minerals that are known to exist in trace amounts in certain species of plant that can still be detected millions of years later.
In rare cases, coprolites have even been found to contain well-preserved insect remains.
There is also a documented case of a coprolite containing an
Trace fossil in the form of footprints of a
Crocodilia, created when a crocodilian stepped on the faecal matter before it became fossilised.
Recognizing coprolites
The recognition of coprolites is aided by their structural patterns, such as spiral or annular markings, content, undigested food fragments, and associated fossil remains. The smallest coprolites are often difficult to distinguish from inorganic pellets or from eggs. Most coprolites are composed chiefly of calcium
phosphate, along with minor quantities of
organic matter. By analyzing coprolites, it is possible to infer the diet of the animal which produced them.
Coprolites have been recorded in deposits ranging in age from the Cambrian period
Some marine deposits contain a high proportion of fecal remains. However, animal excrement is easily fragmented and destroyed, so usually has little chance of becoming fossilized.
Coprolite mining
In 1842 the Rev John Stevens Henslow, a professor of botany at St John's College, Cambridge, discovered coprolites just outside
Felixstowe in
Suffolk in the villages of Trimley St Martin,
and Kirton
and investigated their composition. Realising their potential as a source of available phosphate once they had been treated with
sulphuric acid, he patented an extraction process and set about finding new sources.
Very soon, coprolites were being mined on an industrial scale for use as fertiliser due to their high phosphate content. The major area of extraction occurred over the east of England, centred on Cambridgeshire and the Isle of Ely
The industry declined in the 1880s
See also
Notes
