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Climate in Earth History Studies in Geophysics (1982) / Chapter Skim
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17 The Jurassic Climate
Pages 159-163

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From page 159...
... Unfortunately, with the present state of knowledge it is difhcult to go beyond broad qualitative statements. For the Jurassio, we are denied the excellent information of oceanic surfaceand bottom-water temperatures obtained from oxygen isotope analysis of microfossils in deep sea drilling cores of Cretaceous and Cenozoic strata.
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From page 160...
... Some fossil organisms are good temperature indicators, nota bly hermatypic corals in marine and ferns in terrestrial depos its. Reef-building corals suggest a minimum water tempera ture of about ARC, and there are abundant Jurassic ferns whose living relatives cannot tolerate frost.
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From page 161...
... By far the most abundant coal measures occur over a wide area of the Soviet Union, especially in the Lower and Middle Jurassic, and there are also important Lower Jurassic coals in eastern Australia. In Europe thin Lower Jurassic coal beds are known in the so-called Gresten facies of northern Austria and 161 the Mecsek Mountains of Hungary, also in the basal Liassic of soothing Scandinavia and the Middle Jurassic of the northern Norbh Sea.
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From page 162...
... In contra I, oligotaxic episodes, such as at present, are characterized by lower marine temperatures with more pronounced labtudinal sedimentabon, marine regression, and a lack of anoxicity. During polytaYic episodes, warm, globally equable climates result in reduced oceanic convection, causing expansion and intensificabon of the oxygen minimum layer, while colder climatic intervals give rise to increased circulation rates and better oxygenation of ocean waters.
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From page 163...
... . Depositional history of the ooal-bearing Upper Jurassic Lower Cretao ous Kaotenary Formation, Southern Rocky Mountains, Canada, Geol.
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Key Terms

  • late jurassic
  • lower jurassic
  • upper jurassic
  • swampy conditions
  • anthony hallam

  • oxygen isotope
  • climatic changes
  • humid climate
  • jurassic contains
  • eastern humid

  • drilling cores
  • western arid
  • jura sic
  • polar regions
  • upper triassic

  • strong argument
  • climatic criteria
  • western interior
  • wide latitudinal
  • substantial deposits

  • latitudinal range
  • northward shift
  • basal jurassic
  • jurassic cli
  • jurassic coals

  • abundant jurassic
  • jurassic hermatypic
  • jurassic terrestrial
  • jurassic coal
  • jurassic lower


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