Talk:Stratigraphy of the Cambrian

Sources

• A.Yu. Rozanov, V.V. Khomentovsky, Yu.Ya. Shabanov, G.A. Karlova, A.I. Varlamov, V.A. Luchinina, T.V. Pegel’, Yu.E. Demidenko, P.Yu. Parkhaev, I.V. Korovnikov, N.A. Skorlotova (2008). "To the problem of stage subdivision of the Lower Cambrian". Stratigraphy and Geological Correlation. 16 (1): 1–19. doi:10.1007/s11506-008-1001-3.{{cite journal}}: CS1 maint: multiple names: authors list (link)
• M.A. Semikhatov (2008). "The Upper Precambrian." In: "State of level of scrutiny of Precambrian and Phanerozoic stratigraphy of the Russia. The goals of the further studies." Decisions of the Interdepartmental Stratigraphical Committee and its constant Commissions 38. St.-Petersburg: VSEGEI. pp. 15-27.(in Russian)
• A.Yu. Rozanov, I.Ya. Gogin (2008). "The Cambrian System." In: "State of level of scrutiny of Precambrian and Phanerozoic stratigraphy of the Russia. The goals of the further studies." Decisions of the Interdepartmental Stratigraphical Committee and its constant Commissions 38. St.-Petersburg: VSEGEI. pp. 28-35.(in Russian)
• Khomentovsky, V. V. (2008). "The Yudomian of Siberia, Vendian and Ediacaran systems of the International stratigraphic scale". Stratigraphy and Geological Correlation. 16 (6): 581–598. doi:10.1134/S0869593808060014. - Here it is told about Nemaki-Daldynian, majority of Western scientists incorrectly compare all Nemakit-Daldynian with Fortunian Stage

Stratigraphic Implications of Treptichnus pedum

Seilacher, Adolf (2007). Trace fossil analysis. Springer. p. 226.

"Stratigraphic Implications. Stratigraphic boundaries must be defined by stratotypes that can be referred to in other sections. Working groups of the International Correlation Programs democratically decide, in which country and at what level to put the “Golden Spike”. Nevertheless such decisions have a subjective (if not political) element.

Of the many changes that took place in the transition from the Proterozoic to the Phanerozoic Era, the onset of vertical bioturbation is just one. Treptichnus pedum has the advantage that it is distinctive, common and can be recognized in a variety of facies. On the other hand, it could be argued whether this burrow really represents vertical bioturbation or just a more sophisticated mode of undermat mining.

Thus it is not surprising that the first appearance does not exactly coincide with other bioevents, such as the disappearance of the formerly ruling vendobionts, the radiation of “small shelly fossils”, and eventually of the trilobites. In fact, Treptichnus pedum has lately been found in association with the last vendobionts in Australia and Namibia. Thus it is formally true to say that these strange organisms survived into the Early Cambrian, even though their extinction, and with it the demise of the Ediacaran ecosystem, was certainly more decisive. Possibly geochemical or paleomagnetic excursions would in this case be better chronometers than guide fossils; but unfortunately they cannot be recognized right in the field!"

Treptichnus pedum have very big time range: Uppermost Precambrian to Middle Cambrian, Lower Ordovician! Alecsey(Alnagov (talk) 09:02, 9 May 2009 (UTC))

Articles about treptichnid traces

JENSEN, Sören (2001). "Trace fossils Didymaulichnus cf. tirasensis and Monomorphichnus isp. from the Estonian Lower Cambrian, with a discussion on the Early Cambrian ichnocoenoses of Baltica" (PDF). Proc. Estonian Acad. Sci. Geol. 50 (2): 75–85. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

DZIK, J. (2007). "The Verdun Syndrome: simultaneous origin of protective armour and infaunal shelters at the Precambrian–Cambrian transition". In VICKERS-RICH, P. & KOMAROWER, P. (ed.). The Rise and Fall of the Ediacaran Biota (PDF). Geological Society, London, Special Publications. Vol. 286. pp. 405–414.{{cite book}}: CS1 maint: multiple names: editors list (link)

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.{{cite journal}}: CS1 maint: date and year (link) - systematica of "Treptichnus pedum" traces; redescription of type species Treptichnus pedum (T. pedum from GSSP) as Podolodes pedum; interpretation Didymaulichnus cf. tirasensis as treptichnid. Aleksey(Alnagov (talk) 20:38, 10 May 2009 (UTC))

Inserting into Trichophycus pedum. Martin (Smith609 – Talk) 15:26, 11 May 2009 (UTC)

Amount of species of Early Cambrian fossils in key regions

Source: A.Yu. Rozanov, V.V. Khomentovsky, Yu.Ya. Shabanov, G.A. Karlova, A.I. Varlamov, V.A. Luchinina, T.V. Pegel’, Yu.E. Demidenko, P.Yu. Parkhaev, I.V. Korovnikov, N.A. Skorlotova (2008). "To the problem of stage subdivision of the Lower Cambrian". Stratigraphy and Geological Correlation. 16 (1): 1–19. doi:10.1007/s11506-008-1001-3.{{cite journal}}: CS1 maint: multiple names: authors list (link)

Aleksey(Alnagov (talk) 19:26, 10 May 2009 (UTC))

What is the significance of this data? How has it been statistically corrected for differences in exposure, collection bias, etc? Martin (Smith609 – Talk) 15:24, 11 May 2009 (UTC)

Cambrian system in ...

Cambrian system in the International Stratigraphic Chart of the ICS. 2008

	Series		Stage	Stage boundary stratotype and its index fossil species	Age Ma
	traditional	with sub-trilobite series
O	Lower		Tremadocian	GSSP: Green Point Section, western Newfoundland. Ratified 2000. FAD of conodont Iapetognathus fluctivagus.	488.3 ±1.7
C A M B R I A N	Furongian		Stage 10	FAD of trilobite Lotagnostus americanus	~492
			Stage 9	FAD of trilobite Agnostotes orientalis	~496
			Paibian	GSSP: Wuling Mountains, Huayuan County, NW Hunan Province, China. Ratified 2003. FAD of trilobite Glyptagnostus reticulatus.	~499
	Middle	Series 3	Guzhangian	GSSP: Louyixi, Guzhang County, NW Hunan Province, S. China. Ratified 2008. FAD of trilobite Lejopyge laevigata.	~503
			Drumian	GSSP: Drum Mountains, Millard County, Utah, USA. Ratified 2006. FAD of trilobite Ptychagnostus atavus.	~506.5
			Stage 5	FAD of trilobite Oryctocephalus indicus or Ovatoryctocara granulate	~510
	Lower	Series 2	Stage 4	FAD of trilobite Olenellus or Redlichia	~515
			Stage 3	FAD of first trilobites	~521
		Terreneuvian	Stage 2	FAD of Small Shelly Fossils, or archaeocyathid species	~528
			Fortunian	GSSP: Fortune Head, SE Newfoundland,Canada. Ratified 1992. FAD of trace fossil Treptichnus pedum.	542.0 ±1.0
EDIACARAN

You can use and modify this scheme. Aleksey (Alnagov (talk) 13:31, 23 August 2009 (UTC))