Ichnology is the branch of
geologyGeology is the science and study of the solid and liquid matter that constitutes the Earth. The field of geology encompasses the study of the composition, structure, physical properties, dynamics, and history of Earth materials, and the processes by which they are formed, moved, and changed...
that deals with traces of organismal behavior. It is generally considered as a branch of
paleontologyPaleontology
[from Greek: παλαιός "old, ancient", ὄν, ὀντ- "being, creature", and λόγος "speech, thought"] is the study of prehistoric life, including organisms' evolution and interactions with each other and their environments...
; however, only one division of ichnology, paleoichnology, deals with trace fossils, while neoichnology is the study of modern traces. Parallels can often be drawn between modern traces and trace fossils, helping scientists to decode the possible behavior and anatomy of the trace-making organisms even if no body fossils can be found.
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Ichnology is the branch of
geologyGeology is the science and study of the solid and liquid matter that constitutes the Earth. The field of geology encompasses the study of the composition, structure, physical properties, dynamics, and history of Earth materials, and the processes by which they are formed, moved, and changed...
that deals with traces of organismal behavior. It is generally considered as a branch of
paleontologyPaleontology
[from Greek: παλαιός "old, ancient", ὄν, ὀντ- "being, creature", and λόγος "speech, thought"] is the study of prehistoric life, including organisms' evolution and interactions with each other and their environments...
; however, only one division of ichnology, paleoichnology, deals with trace fossils, while neoichnology is the study of modern traces. Parallels can often be drawn between modern traces and trace fossils, helping scientists to decode the possible behavior and anatomy of the trace-making organisms even if no body fossils can be found. An
ichnologist is a scientist whose area of study and research is ichnology.
Ichnologic studies are based on the discovery and analysis of biogenic structures: features caused by living organisms. Thus, burrows,
trackwayA trackway is an ancient route of travel for people and/or animals. In biology, a trackway can be a set of impressions in the soft earth, usually a set of footprints, left by an animal. A fossil trackway is the fossilized imprint of a trackway. Trackways have been found all over the world...
s, trails and borings are all examples of biogenic structures, but not casts or molds of dead shells or other bodily remains. To keep body and trace fossils nomenclatorially separate, ichnospecies are erected for trace fossils. Ichnotaxa are classified somewhat differently in zoological nomenclature than taxa based on body fossils (see
trace fossil classificationTrace fossils are classified in various ways for different purposes. Traces can be classified taxonomically , ethologically , and toponomically, that is, according to their relationship to the surrounding sedimentary layers...
for more information).
Examples
- Late Cambrian
The Cambrian is the first geological period of the Paleozoic era, lasting from ; it is succeeded by the Ordovician. Its subdivisions, and indeed its base, are somewhat in flux...
trace fossils from intertidal settings include ProtichnitesProtichnites is a genus of trace fossil consisting of the imprints made by the walking activity of arthropods. It is likely that more than one type of arthropod was responsible for these tracks. Euthycarcinoids, aglaspidids and eurypterids are possible contributors. Protichnites consists of two...
and ClimactichnitesClimactichnites is an enigmatic, late Cambrian fossil formed on or within sandy tidal flats around .It is usually interpreted as the trace fossil of a slug-like organism, thought to have moved by crawling on near-shore or on-shore surfaces or burrowing into the sediment.-Morphology:There are two...
, amongst others.
- Mesozoic
The Mesozoic Era is one of three geologic eras of the Phanerozoic eon. The division of time into eras dates back to Giovanni Arduino, in the 18th century, although his original name for the era now called the "Mesozoic" was "Secondary" The Mesozoic Era is one of three geologic eras of the...
dinosaur footprints including ichnogenera such as GrallatorGrallator is an ichnogenus which covers a common type of small, three-toed print made by a variety of bipedal theropod dinosaurs. Grallator-type footprints have been found in formations dating from the late Triassic through to the early Cretaceous periods...
, Atreipus and AnomoepusAnomoepus gracillimus is the name assigned to footprints in the Late Triassic beds of the Connecticut River Valley, Massachusetts, USA in 1802. All four feet have left impressions. The smaller forefeet have five toes, whereas the larger hind feet have three toes. There is also an impression which...
.
External links
- Ichnos An International Journal for Plant and Animal Traces