Editing Devonian, Grampian Highlands

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== Devonian ==
 
== Devonian ==
 
Devonian rocks are largely confined to the peripheral areas of the Grampian Highlands, although scattered downfaulted outliers in the interior point to a more extensive original cover. The Caledonian Orogeny was complete by early Devonian times and the Grampian Highlands were then part of a very large landmass lying astride the equator. Under semi-arid conditions, vast thicknesses of continental sediment were deposited to form the Old Red Sandstone megafacies in two distinct basinal areas, the Argyll Basin and the Orcadian Basin. The Old Red Sandstone succession which borders the Grampian Highlands on the southern side of the Highland Boundary Fault, was deposited in the separate Midland Valley Basin (Cameron and Stephenson, 1985).
 
Devonian rocks are largely confined to the peripheral areas of the Grampian Highlands, although scattered downfaulted outliers in the interior point to a more extensive original cover. The Caledonian Orogeny was complete by early Devonian times and the Grampian Highlands were then part of a very large landmass lying astride the equator. Under semi-arid conditions, vast thicknesses of continental sediment were deposited to form the Old Red Sandstone megafacies in two distinct basinal areas, the Argyll Basin and the Orcadian Basin. The Old Red Sandstone succession which borders the Grampian Highlands on the southern side of the Highland Boundary Fault, was deposited in the separate Midland Valley Basin (Cameron and Stephenson, 1985).
[[File:P915440.png|thumbnail|Sedimentary and volcanic rocks of the Lower Old Red Sandstone and their relationship to the Caledonian plutons (Argyll Suite) of the South-west Highlands. P915440.]]
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[[File:P915440.png|thumbnail|P915440]]
 
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[[File:P915441.png|thumbnail|P915441]]
[[File:P915441.png|thumbnail|Old Red Sandstone and Permo-Triassic rocks of the northern Grampian Highlands. P915441. ]]
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[[File:P220248.jpg|thumbnail|P220248]]
[[File:P220248.jpg|thumbnail|Lower Old Red Sandstone unconformable on Dalradian, Ailnack Gorge, Tomintoul, Banffshire. P220248.]]
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[[File:P915442.png|thumbnail|P915442]]
[[File:P915442.png|thumbnail|Probable correlation of the lithostratigraphical divisions of the Upper Old Red Sandstone in the Nairn–Elgin area (based on Peacock et al., 1968). P915442]]
 
 
In northern Scotland, early Devonian extensional stresses gave rise to crustal fracturing which, in places, was accompanied by short-lived volcanic episodes. A series of half-graben developed in which a variety of alluvial, aeolian and fish-bearing lacustrine sediments accumulated. The largely extensional-tectonic non-marine sedimentary regime was maintained throughout the Devonian, but differential movements and intervals of heavy precipitation periodically led to interbasinal lacustrine conditions.
 
In northern Scotland, early Devonian extensional stresses gave rise to crustal fracturing which, in places, was accompanied by short-lived volcanic episodes. A series of half-graben developed in which a variety of alluvial, aeolian and fish-bearing lacustrine sediments accumulated. The largely extensional-tectonic non-marine sedimentary regime was maintained throughout the Devonian, but differential movements and intervals of heavy precipitation periodically led to interbasinal lacustrine conditions.
  

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