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===The Seilacherian System===
[[File:BoredEncrustedShell.JPG|thumb|Sponge borings (''[[Entobia]]'') and encrusters on a modern bivalve shell, North Carolina; an example of ''Domichnia''.]]
[[Adolf Seilacher]] was the first to propose a broadly accepted [[ethology|ethological]] basis for trace fossil classification.<ref>Seilacher, A (1953) Studien zur paläontologie: 1. Über die methoden der palichnologie. Neues Jahrbuch fur Geologie und Paläontologie, Abhandlungen 96: 421-452.</ref><ref name="Seilacher, A 1964">Seilacher, A (1964) Sedimentological classification and nomenclature of trace fossils. Sedimentology 3: 253-256. [[doi:10.1111/j.1365-3091.1964.tb00464.x]]</ref> He recognized that most trace fossils are created by [[animal]]s in one of five main behavioural activities, and named them accordingly:
* ''Cubichnia'' are the traces of organisms left on the surface of a soft [[sediment]]. This behaviour may simply be resting as in the case of a [[starfish]], but might also evidence the hiding place of [[prey]], or even the ambush position of a [[predator]].
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