Callovian


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Callovian

[kə′lōv·ē·ən]
(geology)
A stage in uppermost Middle or lowermost Upper Jurassic which marks a return to clayey sedimentation.
References in periodicals archive ?
Response of foraminiferal facies to transgressive-regressive cycles in the Callovian of Northest Scotland, Journal of Foraminifera Research, 3, 324-349.
As with Well 143 the new well is initially targeting Jurassic Callovian sands at a depth of 2,200 meters with a secondary objective in the Cretaceous Valanginian limestone at a depth of 1,900 meters.
The increase in kaolinite contents in the Callovian suggests a subtropical humid climate with less prominent seasonal droughts and a higher input of siliclastics into the basin accompanied by a higher nutrient influx (Fursich et al.
It is Callovian and Oxfordian in age and reaches a thickness of more than 300 feet in the basinal area between the Ghawar and Khurais Fields.
He added that during the Middle Callovian 165 million years ago, much of Europe was covered by a shallow sea, creating a chain of large to small islands.
The LGA-1D tested a three-way dip elongated faulted closure in two Dogger limestone formations - the Callovian and the Bathonian.
The obligation to assess the Callovian reservoir through sidetracking well-09 has been deferred until 2017 however a new well location is being reviewed to meet this obligation.
2009): Oxygen and carbon isotope composition of Callovian-Lower Oxfordian (Middle-Upper Jurassic) belemnite rostra from central Poland: A record of a Late Callovian global sea-level rise?
Radiolarian associations are allocated to Callovian, Upper Jurassic, Lower Cretaceous and Santonian (Galli, 1977; Schmidt-Effing, 1979; Baumgartner, 1984).
1987): The Callovian (middle Jurassic) teleosaurid marine crocodiles from central England.
Behavior of organic matter from Callovian shales during low-temperature air oxidation // Ibid.
Callovian and Oxfordian deposits of the south-eastern Caucasus seem to be missing.