A Jurassic was known as by Alexandre Brogniart for the extensive marine limestone exposures of the Jura Mountains in the region in which Germany, France and Switzerland meet.

Divisions
;Independent article Early Jurassic. A Jurassic is normally broken into Lower, Middle, and Upper (or Early, Middle & Late) subdivisions, likewise referred to as Lias, Dogger & Malm. A faunal stages from youngest to oldest come:

Paleogeography
When you took a early Jurassic, a supercontinent Pangea broke up into North America, Eurasia and Gondwana. However, a early Atlantic and Tethyan Oceans were relatively narrow. In a late Jurassic, the southern continent, Gondwana, began to decompose. Climates were warmly using there are no grounds to believe of glaciation. When in the Triassic, apparently there was there is there are no l& touching either pole, and no extensive icecap existed. A geologic record of the Jurassic is swell involved around american Europe, were marine sequences are noticed along a coasts. The shallow sea (epicontinental sea) called a Sundance Sea was present in area of the northern plains of the United States and Canada. Virtually all Jurassic exposures inside Northward America come continental. Crucial Jurassic exposures come likewise detected within Russia, India, South America, Japan, Australasia, and a United Kingdom.

Animals and plants
In a period of a Jurassic, the "highest" life formsSleep in the seas were fish and marine reptiles. A latter include ichthyosaurs, plesiosaurs, and marine crocodiles of the families Teleosauridae and Metriorhynchidae.

In the invertebrate world, several newly groups appeared, like: planktonic foraminifera and calpionelids, which are of wonderful stratigraphic relevance; rudists, a reef-forming variety of bivalves; belemnites; and brachiopods of the terebratulid and rinchonelid groups.

Ammonites (shelled cephalopods) were particularly common & diverse, forming 62 biozones.

Onto land, big archosaurian reptiles remained dominant. Wonderful plant-phytophagic dinosaurs (sauropods) roamed the land, feeding in prairies of ferns and palm-such as cycads and bennettitales. It were preyed upon by big theropods (Ceratosaurs, Megalosaurus, & Allosaurs). When you took a late Jurassic the first birds evolved from small coelurosaur dinosaurs. Everthing these belong to the "lizard hipped" or even saurischian branch of the dinosaurs. Inside direct contrast, Ornithischian dinosaurs were less predominant, although some such as stegosaurs and small ornithopods played important roles when microscopic & medium-to-prominent (but not sauropod dinosaur big) herbivores. In everyone's thoughts, pterosaurs were common, filling several ecological roles today taken by birds.

Popular culture
Though a picture show Jurassic Park brought the word "Jurassic" to domestic usage, numerous of the animals featured in this film would thomas more in all likelihood become incurred in the Cretaceous time.

da:Juratiden de:Jura (Geologie) et:Juura (geoloogia) es:Jurásico fr:Jurassique he:יורה (גאולוגיה) it:Giurassico ja:ジュラ紀 nl:Jura (tijdvak) pl:Jura (okres) pt:Jurássico sl:Jura