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Middle Jurassic |
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Middle Jurassic [′mid·əl jə′ras·ik] (geology) The geologic epoch occurring between the Upper and Lower Jurassic, beginning approximately 170,000,000 years ago. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Dinosaurs in North America developed the improved lung capacity during the middle Jurassic period, roughly 140 million years ago. The 21 kilometre long RDN property is largely underlain by Early to Middle Jurassic stratigraphy similar in age, lithology, alteration and mineralization to that hosting the Eskay Creek precious metal-rich massive sulphide deposit, 40 kilometres to the south-southeast. James Clark and James Hopson of the University of Chicago discovered the skull of what they call a new species, Bocatherium mexicanum (named after the La Boca rock formation where it was found), which they believe dates to the middle Jurassic, roughly 180 million years ago. |
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