Subdivision of the Cretaceous according to the ICS, as of 2022.[1] Vertical axis scale: millions of years ago.
Etymology
Name formality
Formal
Usage information
Celestial body
Earth
Regional usage
Global (ICS)
Time scale(s) used
ICS Time Scale
Definition
Chronological unit
Age
Stratigraphic unit
Stage
Time span formality
Formal
Lower boundary definition
Not formally defined
Lower boundary definition candidates
Base of magnetic polarity chronozone M0r.
Near FAD of the Ammonite Paradeshayesites oglanlensis
Lower boundary GSSP candidate section(s)
Gorgo a Cerbara, Piobbico, Central Apennines, Italy
Upper boundary definition
FAD of the Planktonic Foraminifer Microhedbergella renilaevis
Upper boundary GSSP
Col de Pré-Guittard section, Arnayon, Drôme, France 44°29′47″N5°18′41″E / 44.4964°N 5.3114°E / 44.4964; 5.3114
Upper GSSP ratified
April 2016[2]
Palaeogeography of the Earth in Aptian.
The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous Epoch or Series and encompasses the time from 121.4 ± 1.0 Ma to 113.0 ± 1.0 Ma (million years ago), approximately. The Aptian succeeds the Barremian and precedes the Albian, all part of the Lower/Early Cretaceous.[3]
The Aptian partly overlaps the upper part of the Western European Urgonian Stage.
The Selli Event, also known as OAE1a, was one of two oceanic anoxic events in the Cretaceous Period, which occurred around 120 Ma and lasted approximately 1 to 1.3 million years,[4][5][6] being marked by enhanced silicate weathering,[7] as well as ocean acidification.[8] The Aptian extinction was a minor extinction event hypothesized to have occurred around 116 to 117 Ma.[9]
^International Commission on Stratigraphy. "ICS - Chart/Time Scale". www.stratigraphy.org.
^Kennedy, J.W.; Gale, A.S.; Huber, B.T.; Petrizzo, M.R.; Bown, P.; Jenkyns, H.C. (2017). "The Global Boundary Stratotype Section and Point (GSSP) for the base of the Albian Stage, of the Cretaceous, the Col de Pré-Guittard section, Arnayon, Drôme, France" (PDF). Episodes. 40 (3): 177–188. doi:10.18814/epiiugs/2017/v40i3/017021.
^Gradstein et al. (2004)
^Blok, C. N.; Ineson, J.; Anderskouv, K.; Fantasia, A.; Sheldon, E.; Thibault, N.; Jelby, M. E.; Adatte, T.; Bodin, S. (1 September 2022). "Latitude-dependant climate changes across the Aptian Oceanic Anoxic Event 1a". Palaeogeography, Palaeoclimatology, Palaeoecology. 601: 111085. Bibcode:2022PPP...60111085B. doi:10.1016/j.palaeo.2022.111085. S2CID 249328937.
^Li, Yong-Xiang; Bralower, Timothy J.; Montañez, Isabel P.; Osleger, David A.; Arthur, Michael A.; Bice, David M.; Herbert, Timothy D.; Erba, Elisabetta; Premoli Silva, Isabella (2008-07-15). "Toward an orbital chronology for the early Aptian Oceanic Anoxic Event (OAE1a, ~ 120 Ma)". Earth and Planetary Science Letters. 271 (1–4): 88–100. Bibcode:2008E&PSL.271...88L. doi:10.1016/j.epsl.2008.03.055.
^Leckie, R.; Bralower, T.; Cashman, R. (2002). "Oceanic anoxic events and plankton evolution: Biotic response to tectonic forcing during the mid-Cretaceous" (PDF). Paleoceanography and Paleoclimatology. 17 (3): 1–29. Bibcode:2002PalOc..17.1041L. doi:10.1029/2001pa000623.
^Lechler, Maria; Von Strandmann, Philip A. E. Pogge; Jenkyns, Hugh C.; Prosser, Giacomo; Parente, Mariano (15 December 2015). "Lithium-isotope evidence for enhanced silicate weathering during OAE 1a (Early Aptian Selli event)". Earth and Planetary Science Letters. 432: 210–222. Bibcode:2015E&PSL.432..210L. doi:10.1016/j.epsl.2015.09.052. Retrieved 30 September 2022.
^Erba, Elisabetta; Bottini, Cinzia; Weissert, Helmut J.; Keller, Christina E. (23 July 2010). "Calcareous Nannoplankton Response to Surface-Water Acidification Around Oceanic Anoxic Event 1a". Science. 329 (5990): 428–432. Bibcode:2010Sci...329..428E. doi:10.1126/science.1188886. PMID 20651148. S2CID 19498439. Retrieved 24 January 2023.
^Archangelsky, Sergio. "The Ticó Flora (Patagonia) and the Aptian Extinction Event." Acta Paleobotanica 41(2), 2001, pp. 115-22.
The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous Epoch or Series...
Aptian extinction was an extinction event of the early Cretaceous Period. It is dated to c. 116 or 117 million years ago, in the middle of the Aptian...
étages (stages): the Neocomian, Aptian, Albian, Turonian, and Senonian, later adding the Urgonian between Neocomian and Aptian and the Cenomanian between the...
chenianus: Late Barremian – early Aptian Boreopterus cuiae: late Barremian – early Aptian Brasileodactylus araripensis: Aptian-Albian Cacibupteryx caribensis:...
M.F. Barreto; A. Richard Palmer (2018). "New brachyuran crabs from the Aptian–Albian Romualdo Formation, Santana Group of Brazil: Evidence for a Tethyan...
period. Molecular clock estimates indicate that the rosids originated in the Aptian or Albian stages of the Cretaceous, between 125 and 99.6 million years ago...
Jurassic (Bathonian) Ilek Formation, Russia, Early Cretaceous (Barremian-Aptian) (Presumed to be a cryptobranchoid) †Laccotriton Fengshan fossil bed, China...
Formation of China which is likely around 120 million years old (Barremian-Aptian), and the astacid "Austropotamobius" llopisi from the Las Hoyas site in...
from coracoids Alethoalaornis 2007 Jiufotang Formation (Early Cretaceous, Aptian) China Poorly known Alexornis 1976 La Bocana Roja Formation (Late Cretaceous...
Stegosaurus remains from the Hekou Group of China, both of which date to the Aptian–Albian. The Yanbeilong holotype specimen, SXMG V 00006, was discovered in...
Barremian–Aptian boundary ranged from 126 to 117 Ma until recently (as of 2019), but based on drillholes in Svalbard the defining early Aptian Oceanic Anoxic...
bipedal carnivorous dinosaur of the carcharodontosaurid family from the Aptian stage of the early Cretaceous period, discovered in Argentina. It is closely...
an oceanic anoxic event (OAE) of global scale that occurred during the Aptian stage of the Early Cretaceous, about 120.5 million years ago (Ma). The OAE...
44 million years ago. Saurodectes vrsanskyi from the Early Cretaceous (Aptian) Zaza Formation of Buryatia, Russia, has also been suggested to be a louse...
the extinct Palaeocambarus, known from the Early Cretaceous (Barremian-Aptian) Yixian Formation of China. "Crayfishes from the Jehol biota". Geodiversitas...
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