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| {{Short description|Second subperiod of the Carboniferous}} | |||
| {{otheruses}} | |||
| {{Carboniferous |
{{Redirect2|Pennsylvanian period|Late Carboniferous|the train|Pennsylvanian (train)}} | ||
| {{Use mdy dates|date=August 2020}} | |||
| ⚫ | The '''Pennsylvanian''' is, |
||
| {{Infobox geologic timespan | |||
| | name = Pennsylvanian | |||
| | color = Pennsylvanian | |||
| | top_bar = | |||
| | time_start = 323.2 | |||
| | time_start_uncertainty = 0.4 | |||
| | time_end = 298.9 | |||
| | time_end_uncertainty = 0.15 | |||
| | image_map = Mollweide Paleographic Map of Earth, 310 Ma (Moscovian Age).png | |||
| | caption_map = A map of Earth as it appeared 310 million years ago during the Pennsylvanian Subperiod, Moscovian Age | |||
| | image_outcrop = | |||
| | caption_outcrop = | |||
| | image_art = | |||
| | caption_art = | |||
| <!--Chronology--> | |||
| | timeline = Carboniferous | |||
| <!--Etymology--> | |||
| | name_formality = Formal | |||
| | name_accept_date = | |||
| | alternate_spellings = | |||
| | synonym1 = | |||
| | synonym1_coined = | |||
| | synonym2 = | |||
| | synonym2_coined = | |||
| | synonym3 = | |||
| | synonym3_coined = | |||
| | nicknames = | |||
| | former_names = | |||
| | proposed_names = | |||
| <!--Usage Information--> | |||
| | celestial_body = earth | |||
| | usage = Global (]) | |||
| | timescales_used = ICS Time Scale | |||
| | formerly_used_by = | |||
| | not_used_by = | |||
| <!--Definition--> | |||
| | chrono_unit = Subperiod | |||
| | strat_unit = | |||
| | proposed_by = | |||
| | timespan_formality = Formal | |||
| | lower_boundary_def = First appearance of the ] '']''. | |||
| | lower_gssp_location = Arrow Canyon, Nevada, United States | |||
| | lower_gssp_coords = {{Coord|36.7333|N|114.7778|W|display=inline}} | |||
| | lower_gssp_accept_date = 1996<ref>{{cite journal |last1=Lane |first1=H. |last2=Brenckle |first2=Paul |last3=Baesemann |first3=J. |last4=Richards |first4=Barry |title=The IUGS boundary in the middle of the Carboniferous: Arrow Canyon, Nevada, USA |journal=Episodes |date=December 1999 |volume=22 |issue=4 |pages=272–283 |doi=10.18814/epiiugs/1999/v22i4/003 |doi-access=free |url=https://stratigraphy.org/gssps/files/bashkirian.pdf |access-date=8 December 2020}}</ref> | |||
| | upper_boundary_def = First appearance of the ] '']'' within the ] '']'' chronocline. | |||
| | upper_gssp_location = ], ], ] | |||
| | upper_gssp_coords = {{Coord|50.2458|N|57.8914|E|display=inline}} | |||
| | upper_gssp_accept_date = 1996<ref>{{cite journal |last1=Davydov |first1=Vladimir |last2=Glenister |first2=Brian |last3=Spinosa |first3=Claude |last4=Ritter |first4=Scott |last5=Chernykh |first5=V. |last6=Wardlaw |first6=B. |last7=Snyder |first7=W. |title=Proposal of Aidaralash as Global Stratotype Section and Point (GSSP) for base of the Permian System |journal=Episodes |date=March 1998 |volume=21 |pages=11–18 |doi=10.18814/epiiugs/1998/v21i1/003 |doi-access=free |url=https://stratigraphy.org/gssps/files/asselian.pdf |access-date=7 December 2020}}</ref> | |||
| <!--Atmospheric and Climatic Data--> | |||
| | o2 = | |||
| | co2 = | |||
| | temp = | |||
| | sea_level = | |||
| }} | |||
| ⚫ | The '''Pennsylvanian''' ({{IPAc-en|ˌ|p|ɛ|n|s|əl|ˈ|v|eɪ|n|i|.|ən}} {{respell|pen|səl|VAYN|i|ən}},<ref>{{dictionary.com|Pennsylvanian}}</ref> also known as '''Upper Carboniferous''' or '''Late Carboniferous''') is, on the ] ], the younger of two ] of the ] Period (or the upper of two ] of the Carboniferous System). It lasted from roughly {{Period span|Pennsylvanian}}. As with most other ] units, the ] beds that define the Pennsylvanian are well identified, but the exact date of the start and end are uncertain by a few hundred thousand years. The Pennsylvanian is named after the U.S. state of ], where the coal ] of this age are widespread.<ref name="Gradstein2005">{{cite book|last1=Gradstein|first1=Felix M.|author-link=Felix M. Gradstein|author2=James G. Ogg|author3=Alan G. Smith|author-link3=Alan Gilbert Smith|title=A Geologic Time Scale 2004|url=https://books.google.com/books?id=rse4v1P-f9kC|year=2005|publisher=Cambridge University Press|isbn=978-0-521-78673-7|page=288}}</ref> | ||
| The division between Pennsylvanian and ] comes from North American stratigraphy. In |
The division between Pennsylvanian and ] comes from North American stratigraphy. In North America, where the early ] beds are primarily marine ]s, the Pennsylvanian was in the past treated as a full-fledged geologic period between the Mississippian and the ]. In parts of Europe, the Mississippian and Pennsylvanian are one more-or-less continuous sequence of lowland continental deposits and are grouped together as the Carboniferous Period. The current internationally used geologic timescale of the ] gives the Mississippian and Pennsylvanian the rank of subperiods, subdivisions of the Carboniferous Period. | ||
| ==Life== | ==Life== | ||
| ] in middle Pennsylvanian time |
] | ||
| ===Fungi=== | ===Fungi=== | ||
| All modern ] of fungi have been found in rocks of Pennsylvanian age.<ref>Blackwell, Meredith, Vilgalys, Rytas, James, Timothy Y., and Taylor, John W. , February 2008, ]</ref> | All modern ] of ] have been found in rocks of Pennsylvanian age.<ref>], Vilgalys, Rytas, James, Timothy Y., and Taylor, John W. , February 2008, ]</ref> | ||
| === Invertebrates === | |||
| The major forms of life at this time were the arthropods. Arthropods were far larger than modern ones. '']'', a giant ], was a common sight and the giant ] '']'' "flew the skies".<ref>{{Cite book|title=Fossil Invertebrates|last=Paul D. Taylor|first=David N. Lewis|publisher=The Natural History Museum; First North American edition|year=2005|isbn=0565091832|pages=160}}</ref> It is commonly considered that is because of high oxygen level, however some of those large arthropod records are also known from period with relatively low oxygen, which suggest high oxygen pressure may not have been a primary reason for their gigantism.<ref>{{Cite journal |last1=Gand |first1=G. |last2=Nel |first2=A. N. |last3=Fleck |first3=G. |last4=Garrouste |first4=R. |date=2008-01-01 |title=The Odonatoptera of the Late Permian Lodève Basin (Insecta) |url=https://revistas.ucm.es/index.php/JIGE/article/view/JIGE0808120115A |journal=Journal of Iberian Geology |language=es |volume=34 |issue=1 |pages=115–122 |issn=1886-7995}}</ref><ref>{{Cite journal |last1=Davies |first1=Neil S. |last2=Garwood |first2=Russell J. |last3=McMahon |first3=William J. |last4=Schneider |first4=Joerg W. |last5=Shillito |first5=Anthony P. |date=2021-12-21 |title=The largest arthropod in Earth history: insights from newly discovered''Arthropleura''remains (Serpukhovian Stainmore Formation, Northumberland, England) |url=http://dx.doi.org/10.1144/jgs2021-115 |journal=Journal of the Geological Society |volume=179 |issue=3 |doi=10.1144/jgs2021-115 |issn=0016-7649}}</ref> | |||
| ===Vertebrates=== | ===Vertebrates=== | ||
| ]s were diverse and common; some were several meters long as adults. The ] in the mid |
]s were diverse and common; some were several meters long as adults. The ] in the mid-Pennsylvanian (between the Moscovian and the Kasimovian) removed many amphibian species that did not survive as well in the cooler, drier conditions. Amniotes, however, prospered due to specific key adaptations.<ref name="SahneyBentonFerry2010RainforestCollapse">{{cite journal | last1= Sahney |first1=S. |last2=Benton |first2=M.J. |last3=Falcon-Lang |first3=H.J. | year=2010 | title= Rainforest collapse triggered Pennsylvanian tetrapod diversification in Euramerica | journal=Geology | volume = 38 | pages = 1079–1082 | doi=10.1130/G31182.1 | issue=12}}</ref> One of the greatest evolutionary innovations of the Carboniferous was the ] egg, which allowed for the further exploitation of the land by certain ]s. These included the earliest ] reptiles ('']''), and the earliest known "]" ]s ('']''). Small lizard-like animals quickly gave rise to many descendants. Amniotes underwent a major evolutionary radiation, in response to the drier climate that followed the rainforest ]. | ||
| For some reason, pelycosaurs were able to reach larger sizes before reptiles could, and this trend continued until the ], during which their ] descendants became smaller and ], as the reptilian ] took over, although ] would remain megafaunal until their extinction at the ].<ref name="SahneyBentonFerry2010RainforestCollapse"/><ref name=Kazlev>{{cite web |author=Kazlev MA |year=1998 |url=http://palaeos.com/paleozoic/carboniferous/carboniferous.htm |title=Palaeos Paleozoic: Carboniferous: The Carboniferous Period |access-date=March 30, 2012 |archive-url=https://web.archive.org/web/20120309140141/http://palaeos.com/paleozoic/carboniferous/carboniferous.htm |archive-date=March 9, 2012 |url-status=dead }}</ref> Most pre-rainforest collapse tetrapods remained smaller, probably due to the land being primarily occupied by the gigantic millipedes, scorpions, and flying insects. After the rainforest collapse, the giant arthropods disappeared, allowing amniote tetrapods to achieve larger sizes. | |||
| ==Subdivisions== | ==Subdivisions== | ||
| The Pennsylvanian has been variously subdivided. The international timescale of the ] follows the |
The Pennsylvanian has been variously subdivided. The international timescale of the ] follows the Russian subdivision into four stages:<ref name="ICS2013">Cohen ''et al.'' 2013</ref> | ||
| *] (oldest) | *] (oldest) | ||
| Line 22: | Line 82: | ||
| *] (youngest) | *] (youngest) | ||
| North American subdivision is into five stages, but not precisely the same, with additional (older) Appalachian series names following:<ref>{{cite web |last1=Rice |first1=Charles L. |title=Pennsylvanian system |url=https://pubs.usgs.gov/pp/p1151h/penn.html |website=Contributions to the geology of Kentucky |publisher=United States Geological Survey |access-date=26 October 2020}}</ref><ref>{{cite journal |last1=Kues |first1=Barry S. |title=The Pennsylvanian System in New Mexico— overview with suggestions for revision of stratigraphic nomenclature |journal=New Mexico Geology |date=November 2001 |pages=103–122 |url=https://geoinfo.nmt.edu/publications/periodicals/nmg/23/n4/nmg_v23_n4_p103.pdf |access-date=26 October 2020}}</ref> | |||
| North American subdivision is into five stages, but not precisely the same, with additional (older) Appalachian series names following: | |||
| *] stage, corresponding with the middle and lower part of the ] (oldest) | *] stage, corresponding with the middle and lower part of the ] (oldest) | ||
| *] stage, corresponding with the upper part of the Pottsville group | *] stage, corresponding with the upper part of the Pottsville group | ||
| Line 35: | Line 96: | ||
| The Morrowan corresponds to the Bashkirian. | The Morrowan corresponds to the Bashkirian. | ||
| In the European subdivision, the Carboniferous is divided into two epochs: ] (early) and ] (late). The Silesian starts earlier than the Pennsylvanian and is divided in three ages: | In the European subdivision, the Carboniferous is divided into two epochs: ] (early) and ] (late). The Silesian starts earlier than the Pennsylvanian and is divided in three ages:<ref>{{cite journal |last1=Heckel |first1=P.H. |last2=Clayton |first2=G. |title=The Carboniferous System. Use of the new official names for the subsystems, series, and stages |journal=Geologica Acta |date=2006 |volume=4 |issue=3 |pages=403–407 |doi=10.1344/105.000000354 |url=https://ddd.uab.cat/pub/geoact/geoact_a2006v4n3/geoact_a2006v4n3p403.pdf |access-date=26 October 2020}}</ref> | ||
| *] (corresponding to ] and early Bashkirian) | *] (corresponding to ] and early Bashkirian) | ||
| *] (corresponding to late Bashkirian, Moskovian and Kasimovian) | *] (corresponding to late Bashkirian, Moskovian and Kasimovian) | ||
| *] (corresponding to |
*] (corresponding to Gzhelian). | ||
| ==References== | ==References== | ||
| Line 44: | Line 105: | ||
| == External links == | == External links == | ||
| * , Paleomap project. World map from this time period. | * , Paleomap project. World map from this time period. | ||
| * , ]. Information on stratigraphies, localities, tectonics, and life. | * , ]. Information on stratigraphies, localities, tectonics, and life. | ||
| * , Paleos.com | * , Paleos.com | ||
| * | * | ||
| ⚫ | {{Geological history|p|p}} | ||
| {{Carboniferous footer}} | |||
| ⚫ | {{Geological history|p|p|state=collapsed}} | ||
| {{Authority control}} | |||
| ] | ] | ||
| ] | |||
| ] | |||
| ] | |||
| ] | |||
Latest revision as of 15:14, 13 December 2024
Second subperiod of the Carboniferous "Pennsylvanian period" and "Late Carboniferous" redirect here. For the train, see Pennsylvanian (train).
| Pennsylvanian | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 323.2 ± 0.4 – 298.9 ± 0.15 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |||||||||||||||
.png) A map of Earth as it appeared 310 million years ago during the Pennsylvanian Subperiod, Moscovian Age | |||||||||||||||
| Chronology | |||||||||||||||
| |||||||||||||||
| Etymology | |||||||||||||||
| Name formality | Formal | ||||||||||||||
| Usage information | |||||||||||||||
| Celestial body | Earth | ||||||||||||||
| Regional usage | Global (ICS) | ||||||||||||||
| Time scale(s) used | ICS Time Scale | ||||||||||||||
| Definition | |||||||||||||||
| Chronological unit | Subperiod | ||||||||||||||
| Time span formality | Formal | ||||||||||||||
| Lower boundary definition | First appearance of the Conodont Declinognathodus nodiliferus. | ||||||||||||||
| Lower boundary GSSP | Arrow Canyon, Nevada, United States 36°44′00″N 114°46′40″W / 36.7333°N 114.7778°W / 36.7333; -114.7778 | ||||||||||||||
| Lower GSSP ratified | 1996 | ||||||||||||||
| Upper boundary definition | First appearance of the Conodont Streptognathodus isolatus within the morphotype Streptognathodus wabaunsensis chronocline. | ||||||||||||||
| Upper boundary GSSP | Aidaralash, Ural Mountains, Kazakhstan 50°14′45″N 57°53′29″E / 50.2458°N 57.8914°E / 50.2458; 57.8914 | ||||||||||||||
| Upper GSSP ratified | 1996 | ||||||||||||||
The Pennsylvanian (/ˌpɛnsəlˈveɪni.ən/ pen-səl-VAYN-i-ən, also known as Upper Carboniferous or Late Carboniferous) is, on the ICS geologic timescale, the younger of two subperiods of the Carboniferous Period (or the upper of two subsystems of the Carboniferous System). It lasted from roughly 323.2 million years ago to 298.9 million years ago. As with most other geochronologic units, the rock beds that define the Pennsylvanian are well identified, but the exact date of the start and end are uncertain by a few hundred thousand years. The Pennsylvanian is named after the U.S. state of Pennsylvania, where the coal beds of this age are widespread.
The division between Pennsylvanian and Mississippian comes from North American stratigraphy. In North America, where the early Carboniferous beds are primarily marine limestones, the Pennsylvanian was in the past treated as a full-fledged geologic period between the Mississippian and the Permian. In parts of Europe, the Mississippian and Pennsylvanian are one more-or-less continuous sequence of lowland continental deposits and are grouped together as the Carboniferous Period. The current internationally used geologic timescale of the ICS gives the Mississippian and Pennsylvanian the rank of subperiods, subdivisions of the Carboniferous Period.
Life
Fungi
All modern classes of fungi have been found in rocks of Pennsylvanian age.
Invertebrates
The major forms of life at this time were the arthropods. Arthropods were far larger than modern ones. Arthropleura, a giant millipede, was a common sight and the giant griffinfly Meganeura "flew the skies". It is commonly considered that is because of high oxygen level, however some of those large arthropod records are also known from period with relatively low oxygen, which suggest high oxygen pressure may not have been a primary reason for their gigantism.
Vertebrates
Amphibians were diverse and common; some were several meters long as adults. The collapse of the rainforest ecology in the mid-Pennsylvanian (between the Moscovian and the Kasimovian) removed many amphibian species that did not survive as well in the cooler, drier conditions. Amniotes, however, prospered due to specific key adaptations. One of the greatest evolutionary innovations of the Carboniferous was the amniote egg, which allowed for the further exploitation of the land by certain tetrapods. These included the earliest sauropsid reptiles (Hylonomus), and the earliest known "pelycosaur" synapsids (Archaeothyris). Small lizard-like animals quickly gave rise to many descendants. Amniotes underwent a major evolutionary radiation, in response to the drier climate that followed the rainforest collapse.
For some reason, pelycosaurs were able to reach larger sizes before reptiles could, and this trend continued until the end of the Permian, during which their cynodont descendants became smaller and nocturnal, as the reptilian archosaurs took over, although dicynodonts would remain megafaunal until their extinction at the end of the Triassic. Most pre-rainforest collapse tetrapods remained smaller, probably due to the land being primarily occupied by the gigantic millipedes, scorpions, and flying insects. After the rainforest collapse, the giant arthropods disappeared, allowing amniote tetrapods to achieve larger sizes.
Subdivisions
The Pennsylvanian has been variously subdivided. The international timescale of the ICS follows the Russian subdivision into four stages:
- Bashkirian (oldest)
- Moscovian
- Kasimovian
- Gzhelian (youngest)
North American subdivision is into five stages, but not precisely the same, with additional (older) Appalachian series names following:
- Morrowan stage, corresponding with the middle and lower part of the Pottsville Group (oldest)
- Atokan stage, corresponding with the upper part of the Pottsville group
- Desmoinesian stage, corresponding with the Allegheny Group
- Missourian stage, corresponding with the Conemaugh Group
- Virgilian stage, corresponding with the Monongahela Group (youngest)
The Virgilian or Conemaugh corresponds to the Gzhelian plus the uppermost Kasimovian. The Missourian or Monongahela corresponds to the rest of the Kasimovian. The Desmoinesian or Allegheny corresponds to the upper half of the Moscovian. The Atokan or upper Pottsville corresponds to the lower half of the Moscovian. The Morrowan corresponds to the Bashkirian.
In the European subdivision, the Carboniferous is divided into two epochs: Dinantian (early) and Silesian (late). The Silesian starts earlier than the Pennsylvanian and is divided in three ages:
- Namurian (corresponding to Serpukhovian and early Bashkirian)
- Westphalian (corresponding to late Bashkirian, Moskovian and Kasimovian)
- Stephanian (corresponding to Gzhelian).
References
- "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. September 2023. Retrieved December 16, 2024.
- Lane, H.; Brenckle, Paul; Baesemann, J.; Richards, Barry (December 1999). "The IUGS boundary in the middle of the Carboniferous: Arrow Canyon, Nevada, USA" (PDF). Episodes. 22 (4): 272–283. doi:10.18814/epiiugs/1999/v22i4/003. Retrieved December 8, 2020.
- Davydov, Vladimir; Glenister, Brian; Spinosa, Claude; Ritter, Scott; Chernykh, V.; Wardlaw, B.; Snyder, W. (March 1998). "Proposal of Aidaralash as Global Stratotype Section and Point (GSSP) for base of the Permian System" (PDF). Episodes. 21: 11–18. doi:10.18814/epiiugs/1998/v21i1/003. Retrieved December 7, 2020.
- "Pennsylvanian". Dictionary.com Unabridged (Online). n.d.
- Gradstein, Felix M.; James G. Ogg; Alan G. Smith (2005). A Geologic Time Scale 2004. Cambridge University Press. p. 288. ISBN 978-0-521-78673-7.
- Blackwell, Meredith, Vilgalys, Rytas, James, Timothy Y., and Taylor, John W. Fungi. Eumycota: mushrooms, sac fungi, yeast, molds, rusts, smuts, etc., February 2008, Tree of Life Web Project
- Paul D. Taylor, David N. Lewis (2005). Fossil Invertebrates. The Natural History Museum; First North American edition. p. 160. ISBN 0565091832.
- Gand, G.; Nel, A. N.; Fleck, G.; Garrouste, R. (January 1, 2008). "The Odonatoptera of the Late Permian Lodève Basin (Insecta)". Journal of Iberian Geology (in Spanish). 34 (1): 115–122. ISSN 1886-7995.
- Davies, Neil S.; Garwood, Russell J.; McMahon, William J.; Schneider, Joerg W.; Shillito, Anthony P. (December 21, 2021). "The largest arthropod in Earth history: insights from newly discoveredArthropleuraremains (Serpukhovian Stainmore Formation, Northumberland, England)". Journal of the Geological Society. 179 (3). doi:10.1144/jgs2021-115. ISSN 0016-7649.
- ^ Sahney, S.; Benton, M.J.; Falcon-Lang, H.J. (2010). "Rainforest collapse triggered Pennsylvanian tetrapod diversification in Euramerica". Geology. 38 (12): 1079–1082. doi:10.1130/G31182.1.
- Kazlev MA (1998). "Palaeos Paleozoic: Carboniferous: The Carboniferous Period". Archived from the original on March 9, 2012. Retrieved March 30, 2012.
- Cohen et al. 2013
- Rice, Charles L. "Pennsylvanian system". Contributions to the geology of Kentucky. United States Geological Survey. Retrieved October 26, 2020.
- Kues, Barry S. (November 2001). "The Pennsylvanian System in New Mexico— overview with suggestions for revision of stratigraphic nomenclature" (PDF). New Mexico Geology: 103–122. Retrieved October 26, 2020.
- Heckel, P.H.; Clayton, G. (2006). "The Carboniferous System. Use of the new official names for the subsystems, series, and stages" (PDF). Geologica Acta. 4 (3): 403–407. doi:10.1344/105.000000354. Retrieved October 26, 2020.
External links
- The Late Carboniferous a Time of Great Coal Swamps, Paleomap project. World map from this time period.
- The Carboniferous – 354 to 290 Million Years Ago, University of California Museum of Paleontology. Information on stratigraphies, localities, tectonics, and life.
- The Pennsylvanian Epoch of the Carboniferous Period: 318 to 299 Mya, Paleos.com
- US Geological Survey comparison of time scales
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