Gordia

	Gordia ''Gordia'' is an ichnofossil A trace fossil, also known as an ichnofossil (; from el, ἴχνος ''ikhnos'' "trace, track"), is a fossil record of biological activity but not the preserved remains of the plant or animal itself. Trace fossils contrast with body fossils, ... known from Precambrian to modern sediments and is the most common trace fossil in the Kaili biota displaying "smooth, cylindrical or subcylindrical, non-branching, winding and irregularly curving burrows, commonly self-overcrossing". Probably made by a worm-like creature displaying fodinichnial (sediment scavenging) behaviour. It takes the form of unlined, curving parallel-walled burrows that often end with a nub, probably created as the creature probed the over- or under-lying sediment. It resembles '' Helminthopsis'' and '' Haplotichnus''. References Burrow fossils Invertebrate paleozoology {{trace-fossil-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Haplotichnus ''Haplotichnus'' is an ichnogenus of invertebrate trace fossil that was erected by S.A. Miller in 1889. Buatois et al. (1998) proposed that ''Haplotichnus'' should be synonymized with ''Gordia'' because both exhibit a looping course with self-crossing. Other researchers, such as Wang et al. (2009), have maintained the distinction between the two ichnogenera because ''Haplotichnus'' has sharp bends, whereas those of ''Gordia'' are not sharp. Most recently, Getty and Bush (2016) synonymized ''Haplotichnus'' with ''Treptichnus ''Treptichnus'' (formerly named ''Phycodes'', ''Manykodes'' by J. Dzik, and also known as ''Trichophycus''See e.gfossiilid.info: paleodiversity in Baltoscandia: Trichophycus pedum/ref>) is the preserved burrow of an animal. As such, it is regar ...'' due to the presence of bifurcating projections at the bends. Other features, such as the looping course of the trace, thought to distinguish ''Haplotichnus'' from ''Treptichnus'', are actually seen in one of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Helminthopsis ''Helminthopsis'' is the ichnogenus of a type of trace fossil that is found preserved on the bedding planes of fine-grained sedimentary rocks. It is characterized by short, curvilinear, non-branching, parallel-sided, unlined traces on bedding surfaces. It is thought to represent the submarine feeding trails of an invertebrate organism that worked the surface of muddy substrates in search of food. Because ''Helminthopsis'' traces never cross over themselves, the ichnogenus is distinguished from similar traces assigned to the ''Gordia'' ichnogenus. The similar sounding, but now obsolete, ichnogenus '' Helminthoida'' refers to a somewhat similar trace characterized by regular, back-and-forth meanders, whereas ''Helminthopsis'' traces are irregular. See also * Trace fossil A trace fossil, also known as an ichnofossil (; from el, ἴχνος ''ikhnos'' "trace, track"), is a fossil record of biological activity but not the preserved remains of the plant or animal itself. Trace f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Ichnofossil A trace fossil, also known as an ichnofossil (; from el, ἴχνος ''ikhnos'' "trace, track"), is a fossil record of biological activity but not the preserved remains of the plant or animal itself. Trace fossils contrast with body fossils, which are the fossilized remains of parts of organisms' bodies, usually altered by later chemical activity or mineralization. The study of such trace fossils is ichnology and is the work of ichnologists. Trace fossils may consist of impressions made on or in the substrate by an organism. For example, burrows, borings ( bioerosion), urolites (erosion caused by evacuation of liquid wastes), footprints and feeding marks and root cavities may all be trace fossils. The term in its broadest sense also includes the remains of other organic material produced by an organism; for example coprolites (fossilized droppings) or chemical markers (sedimentological structures produced by biological means; for example, the formation of stromatolites). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Burrow Fossils Burrow fossils are the remains of burrows - holes or tunnels excavated into the ground or seafloor - by animals to create a space suitable for habitation, temporary refuge, or as a byproduct of locomotion preserved in the rock record. Because burrow fossils represent the preserved byproducts of behavior rather than physical remains, they are considered a kind of trace fossil. One common kind of burrow fossil is known as Skolithos, and the similar Trypanites, Ophiomorpha and Diplocraterion. Vertebrate burrows Fish burrows Fossil Lungfish burrows are preserved in the Rocky Point Member of the Chinle Formation in Canyonlands National Park. Invertebrate burrows Examples are Treptichnus pedum ''Treptichnus'' (formerly named ''Phycodes'', ''Manykodes'' by J. Dzik, and also known as ''Trichophycus''See e.gfossiilid.info: paleodiversity in Baltoscandia: Trichophycus pedum/ref>) is the preserved burrow of an animal. As such, it is regar ... and Arenicolites franconicus. Footnotes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]