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Treptichnus
| Treptichnus Temporal range:
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|---|---|
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| Burrows viewed from the side | |
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| Burrows viewed obliquely | |
Trace fossil classification 
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| Ichnogenus: | †Treptichnus Miller, 1889 |
| Ichnospecies | |
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| Synonyms[2][3] | |
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Treptichnus (formerly named Phycodes, Manykodes by J. Dzik,[2] and also known as Trichophycus[3]) is the preserved burrow of an animal. As such, it is regarded as the earliest widespread complex trace fossil. Its earliest appearance, around 542 million years ago (mya),[4] which was contemporaneous with the last of the Ediacaran biota, is used to help define the dividing line, considered geologically at 541 mya, between the Ediacaran and Cambrian periods.[5][6] It is last seen in the fossil record during the Cenomanian (99.7 mya).[1]
- ^ a b AK Rindsberg and DC Kopaska-Merkel. 2005. Treptichnus and Arenicolites from the Steven C. Minkin Paleozoic Footprint Site (Langsettian, Alabama, USA). Alabama Paleontological Society Monograph 1 : 121-141
- ^ a b DZIK, Jerzy (2005). "Behavioral and anatomical unity of the earliest burrowing animals and the cause of the "Cambrian explosion"" (PDF). Paleobiology. 31 (3): 503–521. doi:10.1666/0094-8373(2005)031[0503:BAAUOT]2.0.CO;2. S2CID 55910646.
- ^ a b See e.g. fossiilid.info: paleodiversity in Baltoscandia: Trichophycus pedum
- ^ Srivastava, Purnima (June 2012). "Treptichnus pedum: An Ichnofossil Representing Ediacaran - Cambrian Boundary in the Nagaur Group, the Marwar Supergroup, Rajasthan, India" (PDF). Proc. Indian Natl. Sci. Acad. 78 (2): 161–169. Retrieved April 8, 2016.
- ^ Subcommission on Neoproterozoic Stratigraphy - URL retrieved June 22, 2009
- ^ International Commission on Stratigraphy, International Chronostratigraphic Chart, 2012, http://www.stratigraphy.org/column.php?id=Chart/Time%20Scale
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