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 ?
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.
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.