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Topic: Trichophycus pedum

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	Trichophycus pedum - Wikipedia, the free encyclopedia
		Trichophycus pedum (or Treptichnus pedum; formerly Phycodes pedum) was one of the earliest animals, and the first found in great abundance.
		Trichophycus produced a fairly complicated and distinctive burrow pattern: along with a central, sometimes sinuous or looping burrow, it made successive probes upward through the sediment in search of nutrients, generating a trace pattern reminiscent of a fan or twisted rope.
		In fact, evidence of Trichophycus is used to demarcate the boundary between the Precambrian and Cambrian divisions of the geologic time scale in the stratigraphic reference section at Fortune Head, Newfoundland.
	en.wikipedia.org /wiki/Trichophycus_pedum (191 words)

	Fortune Head - Wikipedia, the free encyclopedia
		The boundary between the Precambrian and Cambrian is demarcated by the presence of trace fossils of Trichophycus pedum, one of the earliest animals.
		Fortune Head records the beginning of a period of increasing biological diversity known as the "Cambrian explosion", and it exhibits a number of other Cambrian and Precambrian fossils, including early shell fossils, vendotaenid algae, soft-bodied megafossils, and microfossils.
		Below Trichophycus, the stratotype at Fortune Head includes traces of the arthropod Monomorphichnus, vertical dwelling burrows from Skolithes and Arenicolites, cnidarian resting burrows from Conichnus and Bergauria, and more intricate feeding burrows from Gyrolithes.
	en.wikipedia.org /wiki/Fortune_Head (444 words)

	Paleozoic - Wikipedia, the free encyclopedia
		The upper (youngest) boundary is set at a major extinction event 300 million years later, known as the Permian extinction.
		Modern practice sets the older boundary at the first appearance of a distinctive trace fossil called Trichophycus pedum.
		At the start of the era, life was confined to bacteria, algae, sponges and a variety of somewhat enigmatic forms known collectively as the Ediacarian fauna.
	en.wikipedia.org /wiki/Paleozoic (457 words)

	Portable Planetariums Home More than a Portable Planetarium (Site not responding. Last check: 2007-10-31)
		Indeed, the stratigraphical occurrence of trace-fossils depicts an evolution to more complicated traces, which, in turn, proves the progressive evolution to more anatomically complicated animals that were able to perform a progressively complex behaviour.
		The first trace with a somewhat complicate pattern is Trichophycus pedum (formerly known as "Phycodes pedum").
		Hence, the ichnofossil assemblage with Trichophycus pedum marks the first occurrence of well-developed, fairly complex metazoan animals, and this is today regarded as the most useful landmark to characterize the boundary between the Precambrian and the Phanerozoic and, synchronously, the Proterozoic and the Cambrian.
	www.planetarios.com /manualpaleo.htm (2175 words)

	Vendian Period
		trace fossil, Trichophycus (formerly Phycodes) pedum defines the lower boundary of the Cambrian in the reference section at Fortune Head, southeastern Newfoundland.
		At least six distinct morphotypes have been identified to date, suggesting that the proportional representation of calcareous taxa in the terminal Proterozoic fauna was not markedly different from that observed in younger periods.
		However, other researchers observe that a mass extinction event is not necessary to explain the disappearance of the Ediacarans from the fossil record; conditions may simply have ceased to be favourable to their preservation with the arrival of more numerous and more diverse scavenging and bioturbating organisms.
	www.peripatus.gen.nz /Paleontology/Vendian.html (4428 words)

	THE DEVELOPMENT OF THE PHANEROZOIC MIXED LAYER: IMPLICATIONS OF INCREASED SEAFOOD UNDER THE SEDIMENT FOR THE ... (Site not responding. Last check: 2007-10-31)
		Data suggest that it is not until the Atdabanian that there is any sort of well-developed mixed layer.
		The very shallowest tier burrows such as Treptichnus pedum and Gyrolithes are no longer routinely preserved.
		However, the styles and quality of preservation are consistent with a (very) shallow mixed layer less than 5 cm.
	gsa.confex.com /gsa/2002AM/finalprogram/abstract_37694.htm (486 words)

	Phanerozoic Encyclopedia Article @ 216.92.11.26 (Site not responding. Last check: 2007-10-31)
		But several hundred taxa of Precambrian metazoa have been identified since systematic study of those forms started in the 1950s.
		Most geologists and paleontologists would probably set the Precambrian-Phanerozoic boundary either at the classic point where the first trilobites and archaeocyatha appear; at the first appearance of a complex feeding burrow called Trichophycus pedum; or at the first appearance of a group of small, generally disarticulated, armored forms termed 'the small shelly fauna'.
		The three different dividing points are within a few million years of each other.
	216.92.11.26 /encyclopedia/Phanerozoic (433 words)

	index
		The Lower Cambrian boundary is presently defined by the appearance of the trace fossil (burrows) Trichophycus pedum.
		Furthermore, there is a general absence in the Precambrian rocks of burrows and other trackways that even soft-bodied forms are capable of producing today.
		It is the first appearance of such a trace fossil, Trichophycus pedum that marks the beginning of Cambrian rocks.
	origins.swau.edu /papers/dinos/paleo/index.html (10890 words)

	Ordovician Trace Fossils of Argentina
		Faecal material represented by Alcyonidiopsis pharmaceus and Tomaculum problematicum are found in fl and green shales interbeded to quartzites at Coraya, Azul Pampa, Huichaira and Alfarcito localities (Jujuy province) (Aceñolaza, 1996; Aceñolaza and Gutiérrez Marco, 1998).
		pedum, Phycodes isp., Plagiogmus isp., Planolites isp., Rusophycus isp., Scolicia isp.
		pedum (traza fósil) en estratos cuarcíticos de San Manuel, Sierras Septentrionales de la Provincia de Buenos Aires.
	www.unt.edu.ar /fcsnat/INSUGEO/geologia_16/13-Acenolaza.htm (6120 words)

	Subcommission on Ediacaran Stratigraphy - home page (Site not responding. Last check: 2007-10-31)
		In 2004, the Terminal Proterozoic Subcommission recognised recent advances made in late Neoproterozoic geology by formalising a new period, the Ediacaran Period (and System).
		632-542 Ma) represents the time from the end of global Marinoan glaciation to the first appearance worldwide of somewhat complicated trace fossils (Trichophycus pedum) that appear in places together with the last remnants of the soft-bodied Ediacara fauna.
		A basal Ediacaran GSSP has been established at Enorama Creek, South Australia, defined at the base of “cap dolostones” that overlie Marinoan glacial deposits of the Elatina Formation (e.g., Knoll et al., 2004a, Knoll et al., 2004b; see also Whitfield, 2004).
	www.stratigraphy.org /ediacaran/main.htm (279 words)

	The Ediacaran Assemblage
		The preservational characteristics of typical Ediacaran assemblages are undeniably unusual (‘characteristic’ might be a better word), and evidence for more widely spread and deeper bioturbation certainly does increase sharply at the base of the Cambrian.
		However, to offer this as a complete explanation for the abrupt disappearance of a distinctive, cosmopolitan fauna simply feels a little too convenient for my taste; I believe something did happen to the Ediacarans near the end of the Vendian or in the earliest Cambrian.
		Phycodes) pedum defines the lower boundary of the Cambrian in the reference section at Fortune Head, southeastern Newfoundland.
	www.peripatus.gen.nz /paleontology/Ediacara.html (7472 words)

	Newsletter 2
		Planolites, Helminthopsis, Gordia and Phycodes pedum (in ascending order), overlain by Lingulella bearing beds were illustrated from Bhutan (in Bhargava, O. (ed.), 1995: Bhutan Himalaya: A Geological Account, Spec.
		Vanrhynsdorp/-/-, shallow marine prodeltaic to delta platform heterolithic successions, Monomorphichnus, Oldhamia, "Phycodes", "Trichophycus", "Treptichnus" et al.
		Nama/Gross Aub/-, shallow marine redbeds, Enigmatichnus, Gordia, Skolithos, Trichophycus, Treptichnus.
	palaeo.gly.bris.ac.uk /personnel/braddy/gbswgnews2.html (3839 words)

	Palaeontologie TU_Berlin
		Therefore, no definitive isochronous time-marker permits a reliable worldwide correlation of the PC/C boundary point (GSSP) for all these sections, instead every section has their idiosyncritically defined PC/C boundary.
		The selection of the trace fossil Phycodes (Trichophycus) pedum as the "global" boundary marker is of limited value because the first appearance of this rather long-ranging burrow may be quite heterochronous depending on the diachronous first appearances of its distinct paleoethological facies at different locations.
		Investigations of initial appearances of metazoan vestiges have, therefore, been focussed on either biomineralized skeletal evidences (i.e.
	www.tu-berlin.de /fb9/palaeontologie/projekt.htm (2177 words)

	"Early Cambria -- Information of Lower Cambrian and Older Faunas - v0.01" (Site not responding. Last check: 2007-10-31)
		A laterally compressed monoplacophoran with an outer shell layer of aragonitic prisms, spherulites, sclerites and an internal fibrous aragonite layer.
		The Lower Cambrian-Cambrian boundary in Eastern Newfoundland is set at the appearance of the ichnofossil Trichophycus pedum in the Global Stratotype Section and Point in the Chapel Island Formation at Fortune Head, Nfld.
		Avalonia apparently attached itself to North America in the Ordovician, was later attached to Europe in the Permian and then was fractured when the Supercontinent of Laurasia broke up and the modern Atlantic Ocean opened.
	bio.cc /Scientists/Dan_Bolser/EARLYCAM.HTM (13366 words)

	pedum
		Find results for pedum and anything else you are looking for instantly!
		Read about pedum in the free online encyclopedia and dictionary.
		At eBay you can find practically anything, even pedum.
	www.roboseek.com /pedum.html (190 words)

	Jeff's First Response (Site not responding. Last check: 2007-10-31)
		All of them are sedimentary rock, of course, which cannot be radiometrically dated.
		So the Trichophycus pedum fossils there could be any age younger than 608 Ma.
		I can find no indication that any of the Cambrian sites you mentioned were radioactively dated, they were all dated by the fossils in them.
	home.comcast.net /~orojeff/part3.html (11362 words)

	Informat.io on Geologic Timescale Table
		First chordates appear, while Edicarian fauna die out.
		Simple trace fossils from worm-like animals (Trichophycus pedum, etc.).
		Possible snowball Earth period; Rodinia begins to break up
	www.informat.io /?title=geologic-timescale-table (1774 words)

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