Turonian
























































































System/
Period

Series/
Epoch

Stage/
Age

Age (Ma)

Paleogene

Paleocene

Danian

younger

Cretaceous
Upper/
Late

Maastrichtian
66.0
72.1

Campanian
72.1
83.6

Santonian
83.6
86.3

Coniacian
86.3
89.8

Turonian
89.8
93.9

Cenomanian
93.9
100.5
Lower/
Early

Albian
100.5
~113.0

Aptian
~113.0
~125.0

Barremian
~125.0
~129.4

Hauterivian
~129.4
~132.9

Valanginian
~132.9
~139.8

Berriasian
~139.8
~145.0

Jurassic

Upper/
Late


Tithonian

older
Subdivision of the Cretaceous system
according to the ICS, as of 2017.[1]

The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous epoch, or a stage in the Upper Cretaceous series. It spans the time between 93.9 ± 0.8 Ma and 89.8 ± 1 Ma (million years ago). The Turonian is preceded by the Cenomanian stage and underlies the Coniacian stage.[2]


At the beginning of the Turonian an anoxic event took place which is called the Cenomanian-Turonian boundary event or the "Bonarelli Event".




Contents






  • 1 Stratigraphic definition


    • 1.1 Subdivision




  • 2 Palaeontology


    • 2.1 Ankylosaurs


    • 2.2 Avialans


    • 2.3 Ceratopsians


    • 2.4 Crocodylomorphs


    • 2.5 Mammals


    • 2.6 Ornithopods


    • 2.7 Plesiosaurs


    • 2.8 Pterosaurs


    • 2.9 Squamatans


    • 2.10 Sauropods


    • 2.11 Theropods (non-avialan)




  • 3 References


    • 3.1 Literature




  • 4 External links





Stratigraphic definition




Lithographic limestone from the Gerofit Formation (Turonian) north of Makhtesh Ramon, southern Israel; a variety of Jerusalem stone (meleke).


The Turonian (French: Turonien) was defined by the French paleontologist Alcide d'Orbigny (1802–1857) in 1842. Orbigny named it after the French city of Tours in the region of Touraine (department Indre-et-Loire), which is the original type locality.


The base of the Turonian stage is defined as the place where the ammonite species Wutinoceras devonense first appears in the stratigraphic column. The official reference profile (the GSSP) for the base of the Turonian is located in the Rock Canyon anticline near Pueblo, Colorado (United States, coordinates: 38° 16' 56" N, 104° 43' 39" W).[3]


The top of the Turonian stage (the base of the Coniacian) is defined as the place in the stratigraphic column where the inoceramid bivalve species Cremnoceramus rotundatus first appears.



Subdivision


The Turonian is sometimes subdivided in Lower/Early, Middle and Upper/Late substages or subages. In the Tethys domain, it contains the following ammonite biozones:



  • zone of Subprionocyclus neptuni (in the Upper Turonian)

  • zone of Collignoniceras woollgari (in the Middle Turonian)

  • zone of Mammites nodosoides

  • zone of Watinoceras coloradoense or Watinoceras devonense (last two both in the Lower Turonian)


Other important index fossils are species of the inoceramid genus Inoceramus (I. schloenbachi, I. lamarcki and I. labiatus). Inoceramids are bivalve Mollusca related to today's mussels.



Palaeontology



Ankylosaurs

























Ankylosaurs of the Turonian
Taxa
Presence
Location
Description
Images

  • Maleevus


Mongolia





Talarurus



  • Talarurus



Bayan Shireh Formation, Mongolia



Avialans































Avialans of the Turonian
Taxa
Presence
Location
Description
Images

Catenoleimus




Bissekty Formation, Uzbekistan
A mid-sized enantiornithine, perhaps 20–25 cm long in life




Ichthyornis



Explorornis




Bissekty Formation, Uzbekistan


Ichthyornis


Turonian - Campanian
Alberta and Saskatchewan, Canada; Alabama, Kansas, New Mexico and Texas, USA; Argentina; Central Asia
The Cretaceous ecological equivalent of modern seabirds such as gulls, petrels, and skimmers. At 60 cm (2.0 ft), it was the size of a gull. Although the wings and breastbone are very modern in appearance (suggesting strong flight ability), the jaws retained numerous small, sharp teeth


Ceratopsians



















Ceratopsia of the Turonian
Taxa
Presence
Location
Description
Images

Zuniceratops




Moreno Hill Formation, New Mexico, USA
The earliest-known ceratopsian to have eyebrow horns and the oldest-known ceratopsian from North America, appears to have been roughly 3 to 3.5 meters (9.8 to 11.5 ft) long and 1 meter (3.3 feet) tall at the hips.




Zuniceratops




Crocodylomorphs































Crocodylomorpha of the Turonian
Taxa
Presence
Location
Description
Images

Baurusuchus



Brazil





Baurusuchus



Montealtosuchus


Turonian to Santonian

Adamantina Formation, São Paulo, Brazil
A terrestrial Peirosaurid

Stratiosuchus



Brazil



Mammals



















Mammalia of the Turonian
Taxa
Presence
Location
Description
Images

Bryceomys



Straight Cliffs Formation of Utah, US.
Smaller than a mouse, thought to behave somewhat similar.



Ornithopods

















































Ornithopoda of the Turonian
Taxa
Presence
Location
Description
Images

Anabisetia




Cerro Lisandro Formation, Neuquén Province, Patagonia, Argentina
A 2 metres (6.6 ft) long elasmarian




Anabisetia





Bactrosaurus





Jeyawati



Bactrosaurus


Turonian to Coniacian

Gobi Desert, Mongolia and China
Would have been 6 m (20 ft) long[1] and 2 m (6.6 ft) high when in the quadrupedal stance, and weighed 1,100–1,500 kg (2,400–3,300 lb). Like many hadrosaurs, it could switch between bipedal and quadrupedal stances, but unusually it had large spines protruding from the vertebrae.

Jeyawati
Turonian

Moreno Hill Formation, New Mexico
A basal hadrosauroid

Macrogryphosaurus


Turonian to early Coniacian

Portezuelo Formation, Argentina
A genus of basal iguanodont, a large bipedal herbivore

Notohypsilophodon



Cenomanian-Turonian

Bajo Barreal Formation, Chubut, Argentina
A hypsilophodontid or other basal ornithopod, Notohypsilophodon would have been a bipedal herbivore. Its size has not been estimated

Shuangmiaosaurus



Cenomanian-Turonian
China
A poorly known iguanodont


Plesiosaurs

















































Plesiosauria of the Turonian
Taxa
Presence
Location
Description
Images

Brachauchenius




Ottawa County, Kansas

Brachauchenius represents the last known occurrence of a pliosaur in North America.




Libonectes





Polyptychodon





Thililua



Libonectes




Britton Formation (Cedar Hill), Texas, USA
A 7–14 m (23–46 ft) long creature, was very similar to the related Elasmosaurus. It had a compact body with a short tail and large flippers. Its small skull had long, forward-facing teeth ideal for catching slippery fish and squid that came together outside of its mouth when the mouth was closed, and was placed atop a very long neck.

Manemergus



Morocco
A genus of polycotylid plesiosaur

Megacephalosaurus




Carlile Shale, Russell County, Kansas


Polyptychodon hudsoni



Texas, USA
A 10 metres (33 ft) long Brachaucheniin pliosaurid

Thililua




High Atlas, Morocco
A genus of polycotylid plesiosaur, the estimated total length of Thililua is 5.5 to 6 metres.


Pterosaurs

























Pterosaurs of the Turonian
Taxa
Presence
Location
Description
Images

Lonchodectes



Upper Chalk, Kent, England



Lonchodraco



Albian-Turonian

Chalk Formation, Kent and Cambridge Greensand, England



Squamatans

























Squamata of the Turonian
Taxa
Presence
Location
Description
Images

Dallasaurus




Arcadia Park Shale, Texas, USA
A basal, small, plesiopedal mososauroid


Russellosaurus




Arcadia Park Shale, Texas, USA
A basal, small, lightly built mosasaur


Sauropods



















Sauropods of the Turonian
Taxa
Presence
Location
Description
Images

Argyrosaurus



Argentina




Theropods (non-avialan)



































































Theropods of the Turonian
Taxa
Presence
Location
Description
Images

  • Bayosaurus



Neuquén, Argentina





Giganotosaurus





Nothronychus



  • Enigmosaurus


Khara Khutul, Mongolia


  • Erlikosaurus



Bayan Shireh Formation of Mongolia


  • Mapusaurus



Huincul Formation, Argentina


  • Nothronychus



New Mexico, USA


  • Segnosaurus



Khan-Bogdsomona, Mongolia


  • Timurlengia


Kyzylkum Desert, Uzbekistan
A small (250 kg) tyrannosauroid.

  • Urbacodon



Uzbekistan


  • Xenotarsosaurus



Bajo Barreal Formation, Chubut Province, Argentina



References





  1. ^ http://www.stratigraphy.org/index.php/ics-chart-timescale


  2. ^ See Gradstein et al. (2004) for a detailed description of the ICS' timescale


  3. ^ The GSSP was established by Kennedy et al. (2005)




Literature




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    Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press.



  • Kennedy, W.J.; Walaszczyk, I. & Cobban, W.A.; 2005: The Global Boundary Stratotype Section and Point for the base of the Turonian Stage of the Cretaceous: Pueblo, Colorado, U.S.A., Episodes 28(2): pp 93–104.



External links



  • GeoWhen Database - Turonian


  • Late Cretaceous timescale, at the website of the subcommission for stratigraphic information of the ICS

  • Stratigraphic charts of the Cretaceous: [1] and [2], at the website of Norges Network of offshore records of geology and stratigraphy

  • Turonian Microfossils: 48 images of Foraminifera









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