Sinemurij
| Era[1] | Period | Milioni godina |
|---|---|---|
| Mezozoik | Kreda | 145,0 |
| Jura | 201,3 ±0,2 | |
| Trijas | 251,0 ±0,4 |
Sinemurij – u geološkoj vremenskoj skali – je jedno od doba i geostratigrafski stadij rane ili donjejurska epohe i stratigrafska serija. Vremenski raspon ovog doba bio je između prije 199,3 ± 2 i 190,8 ± 1,5 miliona godina.[2] Sinemurij prethodio je hetangiju, a iza njega slijedio je plinsbahij.
U Evropi, sinemurijsko doba, skupa sa hetangijskim, ima depozite donje lijaske grupe, u Velikoj Britaniji, poznate kao plavi lijas.
Stratigrafske definicija
Sinemurijski stadij definirao je i uveo u naučnu literaturu francuski paleontolog Alcide d'Orbigny, 1842. Imenovan je po francuskom gradu Semur-en-Auxois, u blizini Dižona. Krečnjačko tlo, formirano iz jurskog krečnjaka regije dijelom je odgovorno za karakter klasičnih vina Sancerre.
Baza sinemurijskog stadija je pri prvom pojavljivanju amonitskih rodova Vermiceras i Metophioceras u stratigrafskim zapisimain. Globalni referentni profil (GSSP ili zlatni vrhunac) sinemurija je na liticama sjeverno od zaseoka East Quantoxhead, 6 km istočno od Watcheta, Somerset, Engleska.
Vrhunac sinemurija (baza plinsbahija) je prva pojava amonitne vrste Bifericeras donovani i amonitnog roda Apoderoceras.
Sinemurij ima šest amonitnih biozona u tetiskom domenu:
- Echioceras raricostatum
- Oxynoticeras oxynotum
- Asteroceras obtusum
- Caenisites turneri
- Arnioceras semicostatum
- Arietites bucklandi
Palaeontologija
Synapsida
Mammaliaformes
Sauropsida
†Ichthyosauria
†Plesiosauria
- Attenborosaurus
- Eretmosaurus
- Plesiosaurus dolichodeirus
Archosauria
Crocodylomorpha
†Ornithischiania
- Bienosaurus
- Fabrosaurus
- Geranosaurus
- Lanasaurus
- Lusitanosaurus
- Lycorhinus
- Merosaurus
- Scelidosaurus
- Scutellosaurus
- Stormbergia
- Tatisaurus
Theropoda
Reference
- ^ Los colores corresponden a los códigos RGB aprobados por la Comisión Internacional de Estratigrafía. Disponible en el sitio de la International Commision on Stratigraphy, en «Standard Color Codes for the Geological Time Scale».
- ^ Benton, Michael J. (2012). Prehistoric Life. Edinburgh, Scotland: Dorling Kindersley. str. 44–45. ISBN 978-0-7566-9910-9.
Dopunska literatura
- Bloos, G. & Page, K.N. 2001: Global Stratotype Section and Point for base of the Sinemurian Stage (Lower Jurassic), Episodes 25(1), pp. 22–28, PDF
- Gradstein, F.M.; Ogg, J.G. & Smith, A.G.: 2004: A Geologic Time Scale 2004, Cambridge University Press.
- d´Orbigny, A.C.V.M.D.; 1842: Paléontologie française. 1. Terrains oolitiques ou jurassiques, Bertrand, Paris.
Vanjski linkovi
- GeoWhen Database - Sinemurian
- Lower Jurassic timescale, at the website of the subcommission for stratigraphic information of the ICS
- Stratigraphic chart of the Lower Jurassic, at the website of Norges Network of offshore records of geology and stratigraphy
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