Inliers and outliers (geology)
Rock (geology), Erosion, Horton in Ribblesdale, Silurian, Carboniferous limestone, Old Red Sandstone
978-613-7-35087-4
6137350878
100
2011-10-09
34.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An inlier is an area of older rocks surrounded by younger rocks. Inliers are typically formed by the erosion of overlying younger rocks to reveal a limited exposure of the older underlying rocks. Faulting or folding may also contribute to the observed outcrop pattern. A classic example from Great Britain is that of the inlier of folded Ordovician and Silurian rocks at Horton in Ribblesdale in North Yorkshire which are surrounded by the younger flat-lying Carboniferous Limestone. The location has long been visited by geology students. Another example from South Wales is the Usk Inlier in Monmouthshire where Silurian age rocks are upfolded amidst Old Red Sandstone rocks of Devonian age. A similar outcrop pattern which results from movement on a thrust fault followed by erosion may be termed a window. Conversely an outlier is an area of younger rock completely surrounded by older rocks. An outlier is typically formed when sufficient erosion of surrounding rocks has taken place to sever the younger rock's original continuity with a larger mass of the same younger rocks nearby. One example from Great Britain is the mass of Triassic sandstone around the Staffordshire town of Leek.
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Минералогия, петрография
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