Editing Solid geology, Cainozoic of north-east Scotland

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== Mesozoic  ==
 
== Mesozoic  ==
Mesozoic sedimentary rocks are widely preserved offshore and reflect the stability of the land masses in the East Grampians and adjacent sea areas since Permian times. Permian and Triassic rocks are preserved only in the extreme north-west of the district, in a strip from Burghead to Lossiemouth. The Upper Permian to Lower Triassic Cutties Hillock and Hopeman sandstones comprise aeolian sandstones with large-scale dune-bedding and sparse fluviatile deposits. The overlying fluviatile sandstones and conglomerates of the Burghead Beds are succeeded by the Upper Triassic Lossiemouth Sandstone, which is also of aeolian origin. This grades upwards into the Stotfield Cherty Rock, a calcrete-dominated sandstone with chert concretions. Jurassic rocks have been proved at depth near Lossiemouth. They consist of basal calcareous mudstones (or marls) overlain by a rhythmic sequence of sandstones, siltstones and mudstones, and succeeded by coarse-grained, kaolinitic sandstones. A hitherto unknown outlier of Lower Cretaceous glauconitic sandstone has been found recently on the [[Moss of Cruden - locality, Cainozoic of north-east Scotland|Moss of Cruden]] (Hall and Jarvis, 1994). No Upper Cretaceous rocks are known in north-east Scotland, but evidence of a Late Cretaceous transgression is given by the presence of nodular flints at the base of the Buchan Ridge Gravel Member, which contains abundant flint pebbles yielding Cretaceous fossils.
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Mesozoic sedimentary rocks are widely preserved offshore and reflect the stability of the land masses in the East Grampians and adjacent sea areas since Permian times. Permian and Triassic rocks are preserved only in the extreme north-west of the district, in a strip from Burghead to Lossiemouth. The Upper Permian to Lower Triassic Cutties Hillock and Hopeman sandstones comprise aeolian sandstones with large-scale dune-bedding and sparse fluviatile deposits. The overlying fluviatile sandstones and conglomerates of the Burghead Beds are succeeded by the Upper Triassic Lossiemouth Sandstone, which is also of aeolian origin. This grades upwards into the Stotfield Cherty Rock, a calcrete-dominated sandstone with chert concretions. Jurassic rocks have been proved at depth near Lossiemouth. They consist of basal calcareous mudstones (or marls) overlain by a rhythmic sequence of sandstones, siltstones and mudstones, and succeeded by coarse-grained, kaolinitic sandstones. A hitherto unknown outlier of Lower Cretaceous glauconitic sandstone has been found recently on the Moss of Cruden (Hall and Jarvis, 1994; Appendix 1). No Upper Cretaceous rocks are known in north-east Scotland, but evidence of a Late Cretaceous transgression is given by the presence of nodular flints at the base of the Buchan Ridge Gravel Member, which contains abundant flint pebbles yielding Cretaceous fossils.
  
 
A thick and more complete succession of Mesozoic rocks occupies the Moray Firth basin. Triassic sandstones rest unconformably on sandstones and conglomerates of the Old Red Sandstone and are overlain by sandstones, black shaly mudstones and siltstones of Early Jurassic to Early Cretaceous age. The Lower Cretaceous rocks also include glauconitic and calcareous sandstones. Upper Cretaceous chalk and calcareous mudstones crop out on the sea bed at the eastern end of the Moray Firth and parallel to the North Sea coast some 15 km offshore from Peterhead.
 
A thick and more complete succession of Mesozoic rocks occupies the Moray Firth basin. Triassic sandstones rest unconformably on sandstones and conglomerates of the Old Red Sandstone and are overlain by sandstones, black shaly mudstones and siltstones of Early Jurassic to Early Cretaceous age. The Lower Cretaceous rocks also include glauconitic and calcareous sandstones. Upper Cretaceous chalk and calcareous mudstones crop out on the sea bed at the eastern end of the Moray Firth and parallel to the North Sea coast some 15 km offshore from Peterhead.
 
 
== References ==
 
== References ==
 
[[References, Cainozoic of north-east Scotland|Full reference list]]
 
[[References, Cainozoic of north-east Scotland|Full reference list]]
  
 
[[Category:Grampian Highlands]]
 
[[Category:Grampian Highlands]]

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