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.
References in periodicals archive ?
The secondary exploration target was for investigating additional resources in Lower to Middle Jurassic reservoir rocks (the Statfjord and Brent Group) and Upper Triassic reservoir rocks (the Lunde formation).
Their work reveals that Clipsham limestone used to repair the Gothic parliament building since the 1920s includes the fossils of echinoids or sea urchins dating back to the Middle Jurassic period more than 160 million years ago.
The backbone originates from a group of dinosaurs that includes the largest land animals to have ever walked on Earth, The dinosaur bone from the Middle Jurassic Period at about 176 million years old was found on a beach at Whitby after it fell out of a cliff face.
And the Triassic is dis-conformably over-lain by the Lower and Middle Jurassic.
Conventional Middle Jurassic Kellaways Beds Oil Potential Re-examination
This bed may be the home for the older fossils from the Middle Jurassic as well, according to a new study.
Dong Ren from Capital Normal University in China said that they found these two very rare copulating froghoppers which provide a glimpse of interesting insect behavior and important data to understand their mating position and genitalia orientation during the Middle Jurassic.
The West Eagle # 1 well will also test a deeper, large stratigraphic pinch-out which is part of what is often called the East Side Oil Play, made up of basal Tertiary or older potential reservoirs up-dip from a postulated middle Jurassic oil source conduit system.
As a result of drilling in the Middle Jurassic age sedimentation, two oil and gas perspective fields were approved.
This includes 27 metres of high quality net oil pay in five zones at depths ranging from 1,240 to 1,321 metres in the same Middle Jurassic reservoirs that were proven productive in the first two wells drilled in the Field.
Jiang [36] named the rocks in Amdo 114 station as the Qiangmuleiqu Formation, which underlies of the Xushan Formation and overlies the Wenquan Formation of Middle Jurassic.
South-East of Fergana Valley, where we are conducting research, used to be flat some 165 million years ago during Middle Jurassic era.