Cambrian Stage 10

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Cambrian Stage 10
~489.5 – 485.4 ± 1.9 Ma
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Chronology
Etymology
Name formalityInformal
Usage information
Celestial body Earth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unit Age
Stratigraphic unit Stage
Time span formalityFormal
Lower boundary definitionNot formally defined
Lower boundary definition candidates FAD of the Trilobite Lotagnostus americanus
Lower boundary GSSP candidate section(s) Duibian, Zhejiang, China
Upper boundary definitionFAD of the Conodont Iapetognathus fluctivagus .
Upper boundary GSSPGreenpoint section, Green Point, Newfoundland, Canada
49°40′58″N57°57′55″W / 49.6829°N 57.9653°W / 49.6829; -57.9653
Upper GSSP ratified2000 [2]

Stage 10 of the Cambrian is the still unnamed third and final stage of the Furongian series. [3] It follows the Jiangshanian and precedes the Ordovician Tremadocian Stage. [4] The proposed lower boundary is the first appearance of the trilobite Lotagnostus americanus around 489.5 million years ago, but other fossils are also being discussed (see below). The upper boundary is defined as the appearance of the conodont Iapetognathus fluctivagus which marks the beginning of the Tremadocian and is radiometrically dated as 485.4 million years ago. [5]

Contents

Naming

The 10th stage of the Cambrian has not been formally named by the ICS yet, [3] although a number of local names exist. Several authors favor the name "Lawsonian" after Lawson Cove, in the Wah Wah Mountains of Utah. [6] [7] The lower part of the North American Skullrockian Stage corresponds roughly to the Cambrian Stage 10. [8] The name "Nelegerian", after the Neleger River in Yakutia, was also proposed in 2011. [9]

Stratotype

The ICS is still discussing which geological section and biostratigraphic marker will be used to define the base of the 10th Cambrian stage. [10] [11]

Likely candidates for the section are still investigated. A first proposal was a section near Duibian, Zhejiang province (China). Note recent publications favor Steamboat Pass in the House Range of Utah. If a conodont is used for the base the stage then many more sections would be likely candidates for the GSSP, e.g. in Australia, Kazakhstan and Canada. [6]

Candidates for the biostratigraphic marker are the first appearance of a trilobite or conodont species. The trilobite Lotagnostus americanus was first suggested by the ICS, but has proven to be problematic. [6] [12] In 2006 another working group proposed the first appearance of Cordylodus andresi . [13] The first appearance of Eoconodontus notchpeakensis is favored by many authors because it is globally widespread and is independent of facies (known from continental rise to peritidal environments). [6]

The Eoconodontus notchpeakensis proposal would also incorporate a non-biostratigraphic marker to correlate the beginning of stage 10 globally. A carbon isotope excursion (the HERB-event) occurs in the lower part of the E. notchpeakensis range. [6]

Subdivisions

Cambrian Stage 10 can be subdivided using different biostratigraphic zones. Several conodont zone and subzones can be distinguished. The same is true for trilobites. [6]

Related Research Articles

First appearance datum (FAD) is a term used by geologists and paleontologists to designate the first appearance of a species in the geologic record. FADs are determined by identifying the geologically oldest fossil discovered, to date, of a particular species. A related term is last appearance datum (LAD), the last appearance of a species in the geologic record.

<span class="mw-page-title-main">Tremadocian</span> Lowest stage of Ordovician

The Tremadocian is the lowest stage of Ordovician. Together with the later Floian Stage it forms the Lower Ordovician Epoch. The Tremadocian lasted from 485.4 to 477.7 million years ago. The base of the Tremadocian is defined as the first appearance of the conodont species Iapetognathus fluctivagus at the Global Boundary Stratotype Section and Point (GSSP) section on Newfoundland.

The Furongian is the fourth and final epoch and series of the Cambrian. It lasted from 497 to 485.4 million years ago. It succeeds the Miaolingian series of the Cambrian and precedes the Lower Ordovician Tremadocian Stage. It is subdivided into three stages: the Paibian, Jiangshanian and the unnamed 10th stage of the Cambrian.

<span class="mw-page-title-main">Wuchiapingian</span> Eighth stage of the Permian

In the geologic timescale, the Wuchiapingian or Wujiapingian is an age or stage of the Permian. It is also the lower or earlier of two subdivisions of the Lopingian Epoch or Series. The Wuchiapingian spans the time between 259.51 and 254.14 million years ago (Ma). It was preceded by the Capitanian and followed by the Changhsingian.

Paibi, a village in Paibi Township, Huayuan County, Xiangxi Tujia and Miao Autonomous Prefecture Hunan, China, is the location of the Global Boundary Stratotype Section and Point (GSSP) which marks the boundary between the third and Furongian epochs of the Cambrian Period on the geologic time scale. Paibi was selected over the Kyrshabakty River section, Malyi Karatau, Kazakhstan, and the GSSP was ratified by the International Union of Geological Sciences in late 2003. It established the first formally agreed upon subdivision of the Cambrian. The village gives its name to the Paibian Age in the Cambrian Period.

The Paibian is the lowest stage of Furongian series of the Cambrian. It follows the Guzhangian and is succeeded by the Jiangshanian Stage. The base is defined as the first appearance of the trilobite Glyptagnostus reticulatus around 497 million years ago. The top, or the base of the Jiangshanian is defined as the first appearance of the trilobite Agnostotes orientalis around 494 million years ago.

The Floian is the second stage of the Ordovician Period. It succeeds the Tremadocian with which it forms the Lower Ordovician epoch. It precedes the Dapingian Stage of the Middle Ordovician. The Floian extended from 477.7 to 470 million years ago. The lower boundary is defined as the first appearance of the graptolite species Tetragraptus approximatus.

The Dapingian is the third stage of the Ordovician period and the first stage of the Middle Ordovician series. It is preceded by the Floian and succeeded by the Darriwilian. The top of the Floian is defined as the first appearance of the conodont species Baltoniodus triangularis which happened about 470 million years ago. The Dapingian lasted for about 2.7 million years until about 467.3 million years ago.

Lotagnostus is a genus of very small trilobites in the order Agnostida, which lived on the outer continental shelves worldwide, during the late Upper Cambrian. It was described by Whitehouse in 1936, and the type species is Lotagnostus trisectus, which was originally described as a species of Agnostus by Salter in 1864.

<span class="mw-page-title-main">Terreneuvian</span> First epoch of the Cambrian Period

The Terreneuvian is the lowermost and oldest series of the Cambrian geological system. Its base is defined by the first appearance datum of the trace fossil Treptichnus pedum around 538.8 million years ago. Its top is defined as the first appearance of trilobites in the stratigraphic record around 521 million years ago. This series' name was formally accepted by the International Commission on Stratigraphy in 2007.

The Jiangshanian is the middle stage of the Furongian series. It follows the Paibian Stage and is succeeded by the still unnamed Stage 10 of the Cambrian. The base is defined as the first appearance of the trilobite Agnostotes orientalis which is estimated to be 494 million years ago. The Jiangshanian lasted until approximately 489.5 million years ago.

The Guzhangian is an uppermost stage of the Miaolingian Series of the Cambrian. It follows the Drumian Stage and precedes the Paibian Stage of the Furongian Series. The base is defined as the first appearance of the trilobite Lejopyge laevigata around 500.5 million years ago. The Guzhangian-Paibian boundary is marked by the first appearance of the trilobite Glyptagnostus reticulatus around 497 million years ago.

The Wuliuan stage is the fifth stage of the Cambrian, and the first stage of the Miaolingian Series of the Cambrian. It was formally defined by the International Commission on Stratigraphy in 2018. Its base is defined by the first appearance of the trilobite species Oryctocephalus indicus; it ends with the beginning of the Drumian Stage, marked by the first appearance of the trilobite Ptychagnostus atavus around 504.5 million years ago.

Cambrian Stage 4 is the still unnamed fourth stage of the Cambrian and the upper stage of Cambrian Series 2. It follows Cambrian Stage 3 and lies below the Wuliuan. The lower boundary has not been formally defined by the International Commission on Stratigraphy. One proposal is the first appearance of two trilobite genera, Olenellus or Redlichia. Another proposal is the first appearance of the trilobite species Arthricocephalus chauveaui. Both proposals will set the lower boundary close to 514 million years ago. The upper boundary corresponds to the beginning of the Wuliuan.

Cambrian Series 2 is the unnamed 2nd series of the Cambrian. It lies above the Terreneuvian series and below the Miaolingian. Series 2 has not been formally defined by the International Commission on Stratigraphy, lacking a precise lower boundary and subdivision into stages. The proposed lower boundary is the first appearance of trilobites which is estimated to be around 521 million years ago.

Iapetognathus fluctivagus is a species of denticulate cordylodan conodonts belonging to the genus Iapetognathus. It existed during the Tremadocian Age of the Ordovician. It is an important index fossil in biostratigraphy.

Westergaardodina is a species-rich genus of spine, U or W-shaped paraconodont known from Middle Cambrian to Lower Ordovician strata.

Eoconodontus is an extinct genus of conodonts of the Late Cambrian. It is a two-elements genus from the Proconodontus lineage.

Conodonts are an extinct class of animals whose feeding apparatuses called teeth or elements are common microfossils found in strata dating from the Stage 10 of the Furongian, the fourth and final series of the Cambrian, to the Rhaetian stage of the Late Triassic. These elements can be used alternatively to or in correlation with other types of fossils in the subfield of the stratigraphy named biostratigraphy.

References

  1. ↑ "Chart/Time Scale". stratigraphy.org. International Commission on Stratigraphy.
  2. ↑ Cooper, Roger; Nowlan, Godfrey; Williams, S. H. (March 2001). "Global Stratotype Section and Point for base of the Ordovician System" (PDF). Episodes. 24 (1): 19–28. doi:10.18814/epiiugs/2001/v24i1/005. Archived (PDF) from the original on 2023-11-27. Retrieved 2024-03-25.
  3. 1 2 "Latest version of international chronostratigraphic chart". International Commission on Stratigraphy. Retrieved 2024-03-25.
  4. ↑ "Stratigraphic Chart". International Commission on Stratigraphy. Archived from the original on 2012-10-30. Retrieved 2024-03-25.
  5. ↑ "GSSP Table - Paleozoic Era". Geologic Timescale Foundation. Archived from the original on 2023-10-08. Retrieved 2024-03-25.
  6. 1 2 3 4 5 6 Landing, E.; Westrop, S.R.; Adrain, J.M. (19 September 2011). "The Lawsonian Stage - the Eoconodontus notchpeakensis FAD and HERB carbon isotope excursion define a globally correlatable terminal Cambrian stage" (PDF). Bulletin of Geosciences: 621–640. doi: 10.3140/bull.geosci.1251 . Archived from the original (PDF) on 2023-08-29.
  7. ↑ Miller, J.F.; Evans, K.R.; Freeman, R.L.; Ripperdan, R.L.; Taylor, J.F. (4 August 2011). "Proposed stratotype for the base of the Lawsonian Stage (Cambrian Stage 10) at the First Appearance Datum of Eoconodontus notchpeakensis (Miller) in the House Range, Utah, USA". Bulletin of Geosciences: 595–620. doi: 10.3140/bull.geosci.1255 .
  8. ↑ Freeman, Rebecca L.; Miller, James F.; Dattilo, Benjamin F. (September 2018). "Linguliform brachiopods across a Cambrian–Ordovician (Furongian, Early Ordovician) biomere boundary: the Sunwaptan–Skullrockian North American Stage boundary in the Wilberns and Tanyard formations of central Texas". Journal of Paleontology. 92 (5): 751–767. Bibcode:2018JPal...92..751F. doi:10.1017/jpa.2018.8. S2CID   134012657.
  9. ↑ N. P. Lazarenko, Ivan Ya. Gogin, T. V. Pegel, G. P. Abaimova (2011). "The Khos-Nelege River section of the Ogon'or Formation: a potential candidate for the GSSP of Stage 10, Cambrian System". Bulletin of Geosciences. 86 (3): 555–568. doi:10.3140/bull.geosci.1270.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  10. ↑ "ISCS Working Groups: Working Group on the Stage 10 GSSP". International Subcommission on Cambrian Stratigraphy. Archived from the original on 2023-09-26.
  11. ↑ P. Yu. Parkhaev, Yu. E. Demidenko, M. A. Kulsha (2020). "Zooproblematica Mobergella radiolata as Index Species of the Lower Cambrian Stage Units" (PDF). Стратиграфия. Геологическая корреляция (in Russian). 28 (2): 34. doi:10.31857/S0869592X20020064. Archived (PDF) from the original on 2024-01-30.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  12. ↑ James Frederick Miller (2019). "Study and Use of Upper Cambrian to Lower Ordovician conodonts in central, southern, and western Laurentia, 1933–2018". Palaeobiodiversity and Palaeoenvironments. 100 (4). doi:10.1007/s12549-019-00380-9.
  13. ↑ Miller, James F.; Ethington, Raymond L.; Evans, Kevin R.; Holmer, Lars E.; Loch, James D.; Popov, Leonid E.; Repetski, John E.; Ripperdan, Robert L.; Taylor, John F. (31 July 2006). "Proposed stratotype for the base of the highest Cambrian stage at the first appearance datum of Cordylodus andresi, Lawson Cove section, Utah, USA". Palaeoworld . 15 (3–4): 384–405. doi:10.1016/j.palwor.2006.10.017.
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