Editing Northumbrian rocks and landscape: a field guide

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'''tuff '''Lithified volcanic ash-fall.
 
'''tuff '''Lithified volcanic ash-fall.
  
'''turbidite '''Rock deposited from a '''turbidity current/flow, '''a fast flowing turbulent current charged with a high sediment load, commonly initiated by the disturbance of soft sediment on a slope. A turbidite is poorly sorted but may show grading and '''''sole structures '''''on its base.
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'''turbidite '''Rock deposited from a '''turbidity current/flow, '''a fast flowing turbulent current charged with a high sediment load, commonly initiated by the disturbance ofsoft sediment on a slope. A turbidite is poorly sorted but may show grading and '''''sole structures '''''on its base.
  
 
'''unconformity '''Surface of contact between two groups of rocks resulting from the tilting or folding and erosion of the lower group (often in an '''''orogenic '''''event) before the deposition of the upper group.
 
'''unconformity '''Surface of contact between two groups of rocks resulting from the tilting or folding and erosion of the lower group (often in an '''''orogenic '''''event) before the deposition of the upper group.
  
'''Variscan Orogeny '''See '''''orogeny.'''''
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'''Variscan Orogeny '''''See '''orogeny.'''''
  
 
'''vein/veinlet '''A fracture, usually sub-vertical, which is mineralized, often with '''''quartz '''''or '''''calcite. '''''Crystals may grow from the walls towards the centre. A '''mineral vein '''normally implies the presence of ore minerals.
 
'''vein/veinlet '''A fracture, usually sub-vertical, which is mineralized, often with '''''quartz '''''or '''''calcite. '''''Crystals may grow from the walls towards the centre. A '''mineral vein '''normally implies the presence of ore minerals.
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'''xenolith '''An inclusion of country rock within an '''''igneous '''''body.
 
'''xenolith '''An inclusion of country rock within an '''''igneous '''''body.
  
'''Yoredale '''Name applied to repeat cycles of limestone-shale-sandstone (-seatearth-coal) '''''(cyclothems) '''''in the Carboniferous (Dinantian, early Namurian), derived from the old name for Wensleydale, where they are typically developed.
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'''Yoredale '''Name applied to repeat cycles oflimestone-shale-sandstone (-seatearth-coal) '''''(cyclothems) '''''in the Carboniferous (Dinantian, early Namurian), derived from the old name for Wensleydale, where they are typically developed.
  
 
== Bibliography ==
 
== Bibliography ==

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