Editing Geological history of Yorkshire

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== Devonian ==
 
== Devonian ==
  
The Devonian was a period during which erosional processes removed much of the upland relief and provided great quantities of coarse sediments to '''intermontane basins''' and to flood plains on the continental margin to the south. However, in the Yorkshire area, no deposits from this period have been proved, and the truncated remnants of the folded Lower Palaeozoic rocks are directly overlain by sediments deposited during the Dinantian (early Carboniferous) marine transgression. This strongly angular '''unconformity''' can be seen at outcrop in the Craven Inliers and to the west and north of the county, suggesting that a similar relationship occurs throughout the county at depth.
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The Devonian was a period during which erosional processes removed much of the upland relief and provided great quantities of coarse sediments to intermontane basins and to flood plains on the continental margin to the south. However, in the Yorkshire area, no deposits from this period have been proved, and the truncated remnants of the folded Lower Palaeozoic rocks are directly overlain by sediments deposited during the Dinantian (early Carboniferous) marine transgression. This strongly angular unconformity can be seen at outcrop in the Craven Inliers and to the west and north of the county, suggesting that a similar relationship occurs throughout the county at depth.
  
Post-Caledonian crustal extension broke up the eroded roots of the Caledonian mountains into a series of relatively buoyant blocks and subsiding '''half-graben''' basins that still influence the topography of northern England today. The Askrigg Block, underlain at depth by the Wensleydale Granite, is defined on its southern margin by the east–southeast trending Craven Fault Belt ([[Craven Fault Zone — Malham to Settle - an excursion|Excursion 2]]), south of which is the Craven Basin ([[:File:YGS_YORKROCK_FIG_03_00.jpg|Figure 3]]b). The western and northern margins of the block are defined by the Dent Fault and the Stainmore Trough (lying between the Askrigg and Alston Blocks), close and parallel to, but mostly just outside the present county boundary. The transgressing early Carboniferous seas first flooded the basins, and locally at the block margins basal conglomerates and reddish sandstones accumulated. As the seas deepened and cleared, shales and limestones of early Dinantian age were deposited in both the Stainmore Trough and Craven Basin.
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Post-Caledonian crustal extension broke up the eroded roots of the Caledonian mountains into a series of relatively buoyant blocks and subsiding half-graben basins that still influence the topography of northern England today. The Askrigg Block, underlain at depth by the Wensleydale Granite, is defined on its southern margin by the east–southeast trending Craven Fault Belt ([[Craven Fault Zone — Malham to Settle - an excursion|Excursion 2]]), south of which is the Craven Basin ([[:File:YGS_YORKROCK_FIG_03_00.jpg|Figure 3]]b). The western and northern margins of the block are defined by the Dent Fault and the Stainmore Trough (lying between the Askrigg and Alston Blocks), close and parallel to, but mostly just outside the present county boundary. The transgressing early Carboniferous seas first flooded the basins, and locally at the block margins basal conglomerates and reddish sandstones accumulated. As the seas deepened and cleared, shales and limestones of early Dinantian age were deposited in both the Stainmore Trough and Craven Basin.
  
 
== Carboniferous ==
 
== Carboniferous ==

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