The Kellaways Formation is a geological formation of the Callovian Series from the Jurassic. It is found in the British Isles, immediately above the Great Oolite Series: below the Oxford Clay Formation and above the Cornbrash. It consists of two layers, the Kellaways Sand, a light green-grey clayish silt and sand with layers of sand concretions, overlying the Kellaways Clay, a dark grey plastic fissile clay.[1]
They were laid down during the Callovian, offshore from the London-Brabant Island, between 165 and 160 million years ago, in the latitude of the modern Mediterranean Sea, when the structure of Britain was still taking shape. At this stage, the coal swamps of the north-western shore of the island had subsided below the sea so that the Kellaways clay was formed in fairly deep water and the Kellaways sand was blown and washed from what had become the hot desert land.
The holotype of the indeterminate eusauropod "Ornithopsis" leedsii has been recovered from this formation.[2]
^"Kellaways Formation". Lexicon of named rock units. British Geological Survey. Retrieved 26 May 2015.
^Noé LF, Liston JJ, Chapman SD. 2010. ‘Old bones, dry subject’: the dinosaurs and pterosaur collected by Alfred Nicholson Leeds of Peterborough, England. Geological Society, London, Special Publications 343: 49–77.
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PreꞒ Ꞓ O S D C P T J K Pg N Type Group Sub-units KellawaysFormation, Oxford Clay, West Walton Formation, Ampthill Clay, Kimmeridge Clay Underlies Portland...
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