Piacenzian

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System	Series	Stage	Age (Ma)
Quaternary	Pleistocene	Gelasian	younger
Neogene	Pliocene	Piacenzian	2.588–3.600
	Pliocene	Zanclean	3.600–5.332
	Miocene	Messinian	5.332–7.246
		Tortonian	7.246–11.608
		Serravallian	11.608–13.65
		Langhian	13.65–15.97
		Burdigalian	15.97–20.43
		Aquitanian	20.43–23.03
Paleogene	Oligocene	Chattian	older
Subdivision of the Neogene Period according to the IUGS, as of July 2009.

The Piacenzian is in the international geologic timescale the upper stage or latest age of the Pliocene. It spans the time between 3.6 ± 0.005 Ma and 2.588 ± 0.005 Ma (million years ago). The Piacenzian is on top of the Zanclean and is followed by the Gelasian (part of the Pleistocene).

The Piacenzian is roughly coeval with the European Land Mammal Mega Zone MN 16, overlaps the late Chapadmalalan and early Uquian South American Land Mammal Ages, and falls inside the more extensive Blancan North American Land Mammal Age. It also correlates with regional stages like the Astian, Redonian, Waltonian (England), Reuverian (Netherlands) or Romanian (Central Europe).

Definition

The Piacenzian was introduced in scientific literature by Swiss stratigrapher Karl Mayer-Eymar in 1858. It is named after the Italian city of Piacenza.

The base of the Piacenzian is at the base of magnetic chronozone C2An (the base of the Gauss chronozone and at the extinction of the planktonic forams Globorotalia margaritae and Pulleniatina primalis. The GSSP for the Piacenzian stage is at Punta Piccola on Sicily, Italy.^[1]

The top of the Piacenzian (the base of the Quaternary system and the Pleistocene series) is defined magnetostratigraphically as the base of the Matuyama (C2r) chronozone (at the Gauss-Matuyama reversal), and isotopic stage 103. Above this point there are notable extinctions of the calcareous nanofossils: Discoaster pentaradiatus and Discoaster surculus.^[2]

Climate

Climate of the Piacenzian would have started as a somewhat wet and warm period in North America occurring just after a brief cooling period of the Zanclean. Deposition of sediments and mollusks of the Piacenzian correspond with the rise in sea level creating the Tamiami Subsea and Jackson Subsea of Florida, Duplin Subsea generally of South Carolina, and Yorktown Subsea of the Outer Banks and inland North Carolina. Dates have been established on the basis of the genera and species of mollusks found.^[3]

References

Notes

↑ Castradori et al. (1998)
↑ Gadstein et al. (2005), p. 28; Rio et al. (1998)
↑ Petuch, Edward J., Ph.D. Florida Atlantic University, Department of Geodsciences. Cenozoic Seas: The View From Eastern North America. CRC Press, Dec. 29, 2003. ISBN 0-8493-1632-4.

Literature

Castradori, D.; Rio, D.; Hilgen, F.J. & Lourens, L.J.; (1998) "The Global Standard Stratotype section and Point (GSSP) of the Piacenzian Stage (Middle Pliocene)" Episodes 21(2): pp 88–93.
Gradstein, F.M.; Ogg, J.G. & Smith, A.G. (eds.) (2005) A Geologic Time Scale 2004 Cambridge University Press, Cambridge, UK, ISBN 0-521-78142-6.
Rio, D., R. Sprovieri, D. Castradori, and E. Di Stefano (1998) "The Gelasian Stage (Upper Pliocene): A new unit of the global standard chronostratigraphic scale" Episodes 21(2): 82-87.
Thompson, R. S. and Fleming, R. F. (1996) "Middle Pliocene vegetation: reconstructions, paleoclimatic inferences, and boundary conditions for climate modeling" Marine Micropaleontology 27(1): pp. 27–49

External links

GeoWhen Database - Piacenzian
Neogene timescale, at the website of the subcommission for stratigraphic information of the ICS
Neogene timescale at the website of the Norwegian network of offshore records of geology and stratigraphy
Piacenzian Microfossils: images of Piacenzian Foraminifera

Neogene Period
Miocene	Pliocene
Aquitanian \|Burdigalian Langhian \| Serravallian Tortonian \| Messinian	Zanclean \| Piacenzian

Geologic history of Earth

Precambrian supereon (4.6 Gya – 542 Mya)

In left column are eons; right column: bold are eras; not bold are periods:

Hadean
(4.6 – 3.8 Gya)

Paleohadean (4.6 – 4.3 Gya)

Mesohadean (4.3 – 4.1 Gya)

Neohadean (4.1 – 3.8 Gya)

Archean
(3.8 – 2.5 Gya)

Eoarchean (3.8 – 3.6 Gya)

Paleoarchean (3.6 – 3.2 Gya)

Mesoarchean (3.2 – 2.8 Gya)

Neoarchean (2.8 – 2.5 Gya)

Proterozoic
(2.5 Gya – 542 Mya)

Paleoproterozoic (2.5 – 1.6 Gya): Siderian (2.5 – 2.3 Gya) Rhyacian (2.3 – 2.05 Gya) Orosirian (2.05 – 1.8 Gya) Statherian (1.8 – 1.6 Gya)

Mesoproterozoic (1.6 – 1 Gya): Calymmian (1.6 – 1.4 Gya) Ectasian (1.4 – 1.2 Gya) Stenian (1.2 – 1 Gya)

Neoproterozoic (1 Gya – 541.0 Mya): Tonian (1 Gya – 850 Mya) Cryogenian (850 – 635 Mya) Ediacaran (635 – 542 Mya)

Mya = millions years ago. Gya = billions years ago.

Phanerozoic eon (542 Mya – Today)

In horizontal bars are eras; in left column are periods; right column: bold are epochs; not bold not italic are ages; italic are chrons:

Paleozoic (542 – 250 Mya)

Cambrian
(542 – 485 Mya)

Terreneuvian (542 – 521 Mya): Fortunian (542 – 529 Mya) Age 2* (529 – 521 Mya)

*Epoch 2 (521 – 509 Mya)*: Age 3 (521 – 514 Mya) Age 4* (514 – 509 Mya)

*Epoch 3 (509 – 497 Mya)*: Age 5 (509 – 505 Mya) Drumian (505 – 501 Mya) Guzhangian (501 – 497 Mya)

Furongian (497 – 485 Mya): Paibian (497 – 494 Mya) Jiangshanian (494 – 490 Mya) Age 10* (490 – 485 Mya)

Ordovician
(485 – 443 Mya)

Early Ordovician (485 – 470 Mya): Tremadocian (485 – 478 Mya) Floian (478 – 470 Mya)

Middle Ordovician (470.0 – 458.4 Mya): Dapingian (470 – 467 Mya) Darriwilian (467 – 458 Mya)

Late Ordovician (458 – 443 Mya): Sandbian (458 – 453 Mya) Katian (453 – 445 Mya) Hirnantian (445 – 443 Mya)

Silurian
(443 – 419 Mya)

Llandovery (443 – 433 Mya): Rhuddanian (443 – 441 Mya) Aeronian (441 – 439 Mya) Telychian (439 – 434 Mya)

Wenlock (434 – 427 Mya): Sheinwoodian (434 – 431 Mya) Homerian (431 – 427 Mya)

Ludlow (427 – 423 Mya): Gorstian (427 – 426 Mya) Ludfordian (426 – 423 Mya)

Pridoli (423 – 419 Mya)

Devonian
(419 – 359 Mya)

Early Devonian (419 – 393 Mya): Lochkovian (419 – 411 Mya) Pragian (411 – 408 Mya) Emsian (408 – 393 Mya)

Middle Devonian (393.3 – 382.7 Mya): Eifelian (393 – 388 Mya) Givetian (388 – 383 Mya)

Late Devonian (382.7 – 358.9 Mya): Frasnian (383 – 372 Mya) Famennian (372 – 360 Mya)

Carboniferous
(360 – 300 Mya)

Mississippian (360 – 323 Mya): Tournaisian (360 – 347 Mya) Viséan (347 – 331 Mya) Serpukhovian (331 – 323 Mya)

Pennsylvanian (323 – 300 Mya): Bashkirian (323 – 315 Mya) Moscovian (315 – 307 Mya) Kasimovian (307 – 304 Mya) Gzhelian (304 – 300 Mya)

Permian
(300 – 250 Mya)

Cisuralian (300 – 272 Mya): Asselian (300 – 295 Mya) Sakmarian (295 – 290 Mya) Artinskian (290 – 284 Mya) Kungurian (284 – 272 Mya)

Guadalupian (272 – 260 Mya): Roadian (272 – 269 Mya) Wordian (269 – 265 Mya) Capitanian (265 – 260 Mya)

Lopingian (260 – 250 Mya): Wuchiapingian (260 – 254 Mya) Changhsingian (254 – 250 Mya)

Kasimovian and Gzhelian comprise Late Pennsylvanian (307.0 – 298.9 Mya) subepoch.

Mesozoic (250 – 65 Mya)

Triassic
(250 – 200 Mya)

Early Triassic (250.17 – 247 Mya): Induan (250 – 248 Mya) Olenekian (248 – 247 Mya)

Middle Triassic (247 – 235 Mya): Anisian (247 – 242 Mya) Ladinian (242 – 235 Mya)

Late Triassic (235 – 200 Mya): Carnian (235 – 228 Mya) Norian (228 – 209 Mya) Rhaetian (209 – 200 Mya)

Jurassic
(200 – 144 Mya)

Early Jurassic (200 – 174 Mya): Hettangian (200 – 199 Mya) Sinemurian (199 – 191 Mya) Pliensbachian (191 – 183 Mya) Toarcian (183 – 174 Mya)

Middle Jurassic (174 – 164 Mya): Aalenian (174 – 170 Mya) Bajocian (170 – 168 Mya) Bathonian (168 – 166 Mya) Callovian (166 – 164 Mya)

Late Jurassic (164 – 145 Mya): Oxfordian (164 – 157 Mya) Kimmeridgian (157 – 152 Mya) Tithonian (152 – 145 Mya)

Cretaceous
(145 – 65 Mya)

Early Cretaceous (144 – 100 Mya): Berriasian (144 – 140 Mya) Valanginian (140 – 133 Mya) Hauterivian (133 – 129 Mya) Barremian (129 – 125 Mya) Aptian (125 – 113 Mya) Albian (113 – 100 Mya)

Late Cretaceous (100 – 65 Mya): Cenomanian (100 – 94 Mya) Turonian (94 – 90 Mya) Coniacian (90 – 86 Mya) Santonian (86 – 84 Mya) Campanian (84 – 72 Mya) Maastrichtian (72 – 65 Mya)

Cenozoic (65 Mya – Today)

Paleogene
(65 – 23 Mya)

Paleocene (65 – 56 Mya): Danian (65 – 62 Mya) Selandian (62 – 59 Mya) Thanetian (59 – 56 Mya)

Eocene (56 – 34 Mya): Ypresian (56 – 48 Mya) Lutetian (48 – 41 Mya) Bartonian (41 – 38 Mya) Priabonian (38 – 34 Mya)

Oligocene (34 – 23 Mya): Rupelian (34 – 28 Mya) Chattian (28 – 23 Mya)

Neogene
(23 – 1 Mya)

Miocene (23 – 5 Mya): Aquitanian (23 – 20 Mya) Burdigalian (20 – 16 Mya) Langhian (16 – 14 Mya) Serravallian (14 – 12 Mya) Tortonian (12 – 7 Mya) Messinian (7 – 5 Mya)

Pliocene (5 – 1 Mya): Piacenzian (5 – 4 Mya) Zanclean (4 – 1 Mya)

Quaternary
(1 Mya – Today)

Pleistocene (1 Mya – 12 kya): Gelasian (1 Mya – 870 kya) Calabrian (870 – 780 kya) Middle Pleistocene (Ionian) (780 – 126 kya) Late Pleistocene (Tarantian) (126 – 12 kya): Oldest Dryas (18 – 16 kya)* Bølling (16 – 15 kya)* Older Dryas (15 – 14 kya)* Allerød (14 – 13 kya)* Younger Dryas (13 – 12 kya)*

Holocene (12 kya – Today): Preboreal (12 – 9 kya)* Boreal (9 – 8 kya)* Atlantic (8 – 5 kya)* Subboreal (5 – 2.5 kya)* Subatlantic (2.5 kya – Today)*

Paleogene, Neogene and early Pleistocene comprise former Tertiary* (65 – 1 Mya) period. Gelasian and Calabrian comprise Early Pleistocene (1 Mya – 780 kya) subepoch.

kya = thousands years ago. Mya = millions years ago. * Not officially recognized by the I.C.S.

Source: International Chronostratigraphic Chart (January 2013). International Commission on Stratigraphy. Retrieved 27 March 2013. Divisions of Geologic Time—Major Chronostratigraphic and Geochronologic Units USGS Retrieved 10 March 2013.

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