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 of geological importance as a large glacial meltwater channel and for sections of exposed Callovian age strata.
The cranial anatomy and taxonomy of Peloneustes philarchus (Sauropterygia, Pliosauridae) from the Peterborough Member (Callovian, Middle Jurassic) of the United Kingdom, Palaeontology.
Response of foraminiferal facies to transgressive-regressive cycles in the Callovian of Northest Scotland, Journal of Foraminifera Research, 3, 324-349.
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., 2005).
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.
(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?