Editing Jurassic, Tertiary and Quaternary around Great Ayton and Roseberry Topping, Cleveland Hills - an excursion

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== Geological and geomorphological background ==
 
== Geological and geomorphological background ==
  
The area is on the western edge of the steep Cleveland Hills escarpment (Cleveland: in the Orkneyinga Saga ''Klifland ''or ''Clifa-land ''district of cliffs'), a classic piece of escarpment country with steep north- and west-facing slopes composed of softer Lower Jurassic rocks (in part Liassic shales) capped by more resistant Middle Jurassic sandstones. Roseberry Topping, a prominent landmark throughout the Cleveland Basin, is an erosional '''outlier''', where the Middle Jurassic sandstone (Ravenscar Group) is detached from the main plateau. This Lower to Middle Jurassic sedimentary succession '''dips''' gently towards the south-southeast. Where the sandstones form the parent materials, acid soils characterize the upland plateaux, producing the heather moorland that is so characteristic of the North York Moors.  
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The area is on the western edge of the steep Cleveland Hills escarpment (Cleveland: in the Orkneyinga Saga ''Klifland ''or ''Clifa-land '''district of cliffs'), a classic piece of escarpment country with steep north- and west-facing slopes composed of softer Lower Jurassic rocks (in part Liassic shales) capped by more resistant Middle Jurassic sandstones. Roseberry Topping, a prominent landmark throughout the Cleveland Basin, is an erosional '''outlier''', where the Middle Jurassic sandstone (Ravenscar Group) is detached from the main plateau. This Lower to Middle Jurassic sedimentary succession '''dips''' gently towards the south-southeast. Where the sandstones form the parent materials, acid soils characterize the upland plateaux, producing the heather moorland that is so characteristic of the North York Moors.  
  
 
Although the Liassic sediments on the scarp slope are generally softer shales, the Middle Lias does include two more durable rock formations: the Staithes Formation and the Cleveland Ironstone Formation. Both form minor bench-like features and escarpments on the scarp slopes.
 
Although the Liassic sediments on the scarp slope are generally softer shales, the Middle Lias does include two more durable rock formations: the Staithes Formation and the Cleveland Ironstone Formation. Both form minor bench-like features and escarpments on the scarp slopes.

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