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Kandreho Formation
The Kandreho Formation is an Early Jurassic (middle or late Toarcian) geological formation of the Mahajanga Basin of Madagascar. The marly limestones of the formation were deposited in a subtidal lagoonal environment. The formation overlies the '' Bouleiceras'' and '' Spiriferina'' beds of the early Toarcian and has been correlated to the Marrat Formation of Saudi Arabia. Fossils of the marine crocodylian '' Andrianavoay'' (originally classed as a species of ''Steneosaurus'') as well as bivalves and the ammonite '' Nejdia'' have been found in the formation. at Fossilworks.orgBuffetaut et al., 1981, p.314 The name Kand ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toarcian
The Toarcian is, in the ICS' geologic timescale, an age and stage in the Early or Lower Jurassic. It spans the time between 182.7 Ma (million years ago) and 174.1 Ma. It follows the Pliensbachian and is followed by the Aalenian. The Toarcian Age began with the Toarcian turnover, the extinction event that sets its fossil faunas apart from the previous Pliensbachian age. It is believed to have ended with a global cooling event known as the Comptum Cooling Event, although whether it represented a worldwide event is controversial. Stratigraphic definitions The Toarcian takes its name from the city of Thouars, just south of Saumur in the Loire Valley of France. The stage was introduced by French palaeontologist Alcide d'Orbigny in 1842, after examining rock strata of this age in a quarry near Thouars. In Europe this period is represented by the upper part of the Lias. The base of the Toarcian is defined as the place in the stratigraphic record where the ammonite genus '' Eoda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andrianavoay
''Andrianavoay'' (meaning "noble crocodile" in Malagasy) is an extinct genus of teleosauroid from the Bathonian (in the Middle Jurassic) Kandreho Formation of Madagascar. The type species, ''A. baroni'', was originally named "''Steneosaurus ''Steneosaurus'' (from el, στενός , 'narrow' and el, σαῦρος , 'lizard') is a dubious genus of teleosaurid crocodyliform from the Middle or Late Jurassic (Callovian or early Oxfordian) of France. The genus has been used as a was ...''" ''baroni'' by ET Newton in 1893 on the basis of a partial skull listed as "NHMUK PV R 1999",Newton R. 1893. On the discovery of a secondary reptile in Madagascar: ''Steneosaurus baroni'' ; (n sp.). with a reference to some post-Tertiary vertebrate remains from the same country recently acquired by the British Museum (Natural History). ''Geological Magazine'' 10: 193-198 and an associated osteoderm from Andranosamonta, Madagascar. In her unpublished 2019 thesis, Michela Johnson coined the no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marne Di Monte Serrone
The Marne di Monte Serrone ("Monte Serrone Marl") is a geological formation in Italy, dating to roughly between 181 and 178 million years ago,Baldanza, 1989Sabatino et al., 2009 and covering the early and middle Toarcian stage of the Jurassic Period of central Italy. It is the regional equivalent to the Toarcian units of Spain such as the Turmiel Formation, units in Montenegro, such as the Budoš Limestone and units like the Wazzant Formation and the Azilal Formation of Morocco.Monaco, 1994 Description The Marne di Monte Serrone was first defined by Pialli in 1969.Pialli, 1969 The formation is characterised for be one of the most complete sections of the Toarcian paleobiographical strata around Europe.Palliani & Mattioli, 1994 It is also one of the best places on southern Europe where the strata shows the effects of the Lower Toarcian anoxic event (TAE). The formation also provides data about the changes after the Toarcian AE, with changes on the deposited micritic limestone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Toarcian Turnover
The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of the Mesozoic Era and is named after the Jura Mountains, where limestone strata from the period were first identified. The start of the Jurassic was marked by the major Triassic–Jurassic extinction event, associated with the eruption of the Central Atlantic Magmatic Province. The beginning of the Toarcian Stage started around 183 million years ago and is marked by an extinction event associated with widespread oceanic anoxia, ocean acidification, and elevated temperatures likely caused by the eruption of the Karoo-Ferrar large igneous provinces. The end of the Jurassic, however, has no clear boundary with the Cretaceous and is the only boundary between geological periods to remain formally undefined. By the beginning of the Jurassic, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bemaraha Formation
The Bemaraha Formation is a Middle Jurassic (early Bajocian to early Bathonian) geological formation of the Morondava Basin of Madagascar. The lime mudstones, grainstones and limestones of the formation were deposited in lagoonal and reefal environments. Fossils of groups of invertebrates and theropod and sauropod tracks have been found in the formation. at Fossilworks.org The Sahalaly River tracksite yielded a single trackway belonging to a quadrupedal dinosaur, possibly a sauropod.Wagensommer et al., 2010, p.127 Sauropod tracks are rare, making up as little as 1 percent of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isalo III Formation
The Isalo III Formation is a geological formation in Madagascar, off the eastern coast of Africa. It dates back to the Middle Jurassic.Weishampel et al., 2004, pp.542-543 The use of the term "Isalo III" is somewhat controversial as the two prior units Isalo I and II are Triassic cross-bedded sandstone units that form a continuous depositional sequence, while the "Isalo III" sandstones are not part of the same depositional sequence, and were deposited considerably later. and are perhaps better treated as part of several separate formations.Geiger et al., 2004 It is traditionally divided into two subunits the lower, Bajocian aged Isalo IIIa unit also known as the Beronono Formation and the upper, Bathonian aged Isalo IIIb unit also known as the Sakaraha Formation or Sakahara Formation. The Sakaraha Formation consists of sandstones, marls and carbonates and represents a coastal plain environment, and is laterally equivalent to the predominantly carbonate Bemaraha Formation, which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology Of Madagascar
The geology of Madagascar comprises a variety of rocks of Precambrian age which make up the larger part of the east and centre of the island. They are intruded by basalts and rhyolites of Mesozoic to Cenozoic age. In contrast, the western part of the island is formed from sedimentary rocks of Carboniferous to Quaternary age. Archean rocks occur from the northeast portion of the island down to the south in the Ranotsara shear zone. Rocks in the northern portion of Madagascar are greenstone belts, from the Archean or Paleoproterozoic age. Summary The center and eastern portions of the island consist primarily of metamorphic and igneous Precambrian basement granites, migmatites, and schists, ranging in age from 3 billion to 550 million years old. They are mostly overlain by laterite clays. The Itremo Massif consists of quartzite and marble outcrops 630 million years in age. The Morondava, Mahajanga and Ambilobe sedimentary basins occur along the western third of the island ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Fossiliferous Stratigraphic Units In Madagascar
Several fossiliferous stratigraphic units in Madagascar have provided fossils, most notably the Maastrichtian Maevarano Formation and the Jurassic Isalo III Formation. The oldest fossil-bearing formations date to ages before the break-up of Madagascar from Africa and India; the units of the Sakoa Group are found in both India and Madagascar, while the Beaufort Group is shared with southern Africa. __NOTOC__ See also * Lists of fossiliferous stratigraphic units in Africa ** List of fossiliferous stratigraphic units in Mozambique ** List of fossiliferous stratigraphic units in Seychelles ** List of fossiliferous stratigraphic units in South Africa * Geology of Madagascar References Further reading * O. Appert. 1977. Die Glossopteris flora der Sakoa in Sudwest-Madagaskar. Palaeontographica Abteilung B 162:1-50 * * L. R. Cox. 1936. Karroo Lamellibranchia from Tanganyika Territory and Madagascar. Quarterly Journal of the Geological Society of London 92(365):32-56 * A. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macrospondylus
''Macrospondylus'' is an extinct genus of machimosaurid teleosauroid crocodyliform from the Early Jurassic (Toarcian) of Europe. Fossils are known from the Posidonia Shale of Germany, the Whitby Mudstone of the United Kingdom, and the "''schistes bitumineux"'' of Luxembourg. Evolutionary relationships ''Macrospondylus'' has historically been synonymized with ''Steneosaurus''. A 2005 phylogenetic analysis of Thalattosuchia, however, did not support the monophyly of ''Steneosaurus'', as the genera ''Machimosaurus ''Machimosaurus'' is an extinct genus of machimosaurid crocodyliform from the Late Jurassic (Kimmeridgian and Tithonian) and Early Cretaceous. The type species, ''Machimosaurus hugii'', was found in Switzerland. Other fossils have been found ...'' and '' Teleosaurus'' both fell within ''Steneosaurus''. Reinforcing the paraphyly of ''Steneosaurus'', Young et al. (2012), Ősi et al. (2018), and Wilberg et al. (2019) recovered ''Steneosaurus bollensis'' and other ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossilworks
Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals, plants, and microorganisms. History The Paleobiology Database (PBDB) originated in the NCEAS-funded Phanerozoic Marine Pale ..., a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was created in 1998 by John Alroy and is housed at Macquarie University. It includes many analysis and data visualization tools formerly included in the Paleobiology Database.{{cite web, title=Frequently asked questions, url=http://www.fossilworks.org/cgi-bin/bridge.pl?page=FAQ, publisher=Fossilworks, access-date=17 December 2021 References {{Reflist External links {{Wikidata property, P842 * [Baidu] |
