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Encyclopedia > Late Jurassic

Upper Jurassic (also known as Malm) was an epoch of the Jurassic geologic period. It lasted from 161,2 Ma to 145,5 Ma (million years ago). A division of geologic time less than a period and greater than an age. ... The Jurassic Period is a major unit of the geologic timescale that extends from about 200 Ma (million years ago), at the end of the Triassic to 146 Ma, at the beginning of the Cretaceous. ... In geology, a period or age is a time span of many millions of years that are assumed to have had similar characteristics. ... Mega-annum, usually abbreviated as Ma, is a unit of time equal to one million years. ...


It is divided into three ages:

  Tithonian (150.8 ± 4.0 – 145.5 ± 4.0 Ma)
  Kimmeridgian (155.7 ± 4.0 – 150.8 ± 4.0 Ma)
  Oxfordian (161.2 ± 4.0 – 155.7 ± 4.0 Ma)

The Tithonian (141-135 MYA) is the most recent faunal stage of the Jurassic era. ... The Kimmeridgian is a stage of the Late Jurassic Epoch. ... The Oxfordian is the first stage of the Late Jurassic Epoch. ...

Life

This period was well known for many famous types of dinosaurs: Orders & Suborders Saurischia Sauropodomorpha Theropoda Ornithischia Thyreophora Ornithopoda Marginocephalia Dinosaurs were vertebrate animals that dominated the terrestrial ecosystem for over 160 million years, first appearing approximately 230 million years ago. ...

Many smaller animals were flourishing: Families Brachiosauridae Camarasauridae Cetiosauridae Diplodocidae Euhelopodidae Nemegtosauridae Titanosauridae Vulcanodontidae Sauropoda, the sauropods, are a suborder or infraorder of the saurischian (lizard-hipped) dinosaurs. ... Species (type) For many decades, Brachiosaurus (brack-ee-oh-SORE-us) was the largest dinosaur known. ... Genera Subfamily Apatosaurinae:    Apatosaurus    Eobrontosaurus Subfamily Diplodocinae:    Barosaurus    Diplodocus    Seismosaurus    Supersaurus Diplodocids, or members of the family Diplodocidae, are sauropod dinosaurs such as the Diplodocus and the Apatosaurus. ...

Orders Procolophonia (extinct) Testudines Araeoscelidia (extinct) Avicephala (extinct) Younginiformes (extinct) Sauropterygia Ichthyosauria (extinct) Placodontia (extinct) Nothosauria (extinct) Plesiosauria (extinct) Sphenodontia Squamata Prolacertiformes (extinct) Archosauria Crurotarsi Order Aetosauria Order Phytosauria Order Rauisuchia Order Crocodilia Ornithodira Pterosauria (extinct) Marasuchus (extinct) Dinosauria (extinct) Order Saurischia Order Ornithischia Reptiles are tetrapods and amniotes, animals... Families Many, see text. ... Orders Subclass Monotremata Monotremata Subclass Marsupialia Didelphimorphia Paucituberculata Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia Subclass Placentalia Xenarthra Dermoptera Desmostylia Scandentia Primates Rodentia Lagomorpha Insectivora Chiroptera Pholidota Carnivora Perissodactyla Artiodactyla Cetacea Afrosoricida Macroscelidea Tubulidentata Hyracoidea Proboscidea Sirenia The mammals are the class of vertebrate animals primarily characterized by the presence of mammary... Orders Many - see section below. ...

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Jurassic period
Lower/Early Jurassic Middle Jurassic Upper/Late Jurassic
Hettangian | Sinemurian
Pliensbachian | Toarcian		 Aalenian | Bajocian
Bathonian | Callovian		 Oxfordian | Kimmeridgian
Tithonian

  Results from FactBites:
 
Palaeos Mesozoic: Jurassic: The Jurassic Period (2386 words)
All of the new photosynthetic forms of the Jurassic were "red," with chloroplasts of the red algae type, with chlorophyll c, rather than the chlorophyll b of green plants and green algae (Chlorophyta).
The Jurassic variety are probably some type of radiolarian-like protist and may have nothing at all to do with the Paleozoic acritarchs.
The Jurassic radiation of radiolarians was largely a radiation of the Spumellaria in the latter half of the Jurassic.
Jurassic (360 words)
The Jurassic was named by Alexandre Brongniart for extensive marine limestone exposures in the Jura Mountains in the region where Germany, France and Switzerland meet.
The Jurassic follows the Triassic, is followed by the Cretaceous and constitutes the middle period of the Mesozoic Era -- the Age of Dinosaurs.
During the Jurassic the "highest" life forms living in the seas were fish and marine reptiles marine.
  More results at FactBites »

 

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