Editing Northumbrian rocks and landscape: a field guide

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'''sphalerite '''(blende) ZnS Commonly a brown or black mineral with a resinous lustre and variable form. Most common ore of zinc.
 
'''sphalerite '''(blende) ZnS Commonly a brown or black mineral with a resinous lustre and variable form. Most common ore of zinc.
  
'''spillway''' 1. General term for glacial '''''meltwater '''''or '''''overflow channels. '''''2. Overflow channel constructed on a dam.
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'''spillway 1. '''General term for glacial '''''meltwater '''''or '''''overflow channels. '''''2. Overflow channel constructed on a dam.
  
 
'''sponge '''Primitive invertebrates with an asymmetrical body supported by spongin and/or siliceous or calcareous spicules. Some may have a massive calcareous basal skeleton.
 
'''sponge '''Primitive invertebrates with an asymmetrical body supported by spongin and/or siliceous or calcareous spicules. Some may have a massive calcareous basal skeleton.
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'''stope '''Underground excavation in a '''''vein.'''''
 
'''stope '''Underground excavation in a '''''vein.'''''
  
'''strike '''Intersection of a bedding plane, or other planar surface, with the horizontal.
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'''strike '''Intersection ofa bedding plane, or other planar surface, with the horizontal.
  
'''strike-slip''' See '''''fault.'''''
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'''strike-slip ''See fault.'''''
  
'''stromatolite '''A carbonate rock with a fine horizontal, domal or columnar banding, reflecting the control of deposition by an '''''algal '''''mat or microbial community living on the surface of the sediment.
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'''stromatolite '''A carbonate rock with a fine horizontal, domal or columnar banding, reflecting the control ofdeposition by an '''''algal '''''mat or microbial community living on the surface of the sediment.
  
 
'''stylolite '''An irregular, suture like contact, most common in limestones, produced by solution of the rock under high pressure.
 
'''stylolite '''An irregular, suture like contact, most common in limestones, produced by solution of the rock under high pressure.
  
'''subduction '''The process whereby oceanic crust descends into the interior of the Earth beneath oceanic or continental crust at a convergent '''''plate ''''' margin.
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'''subduction '''The process whereby oceanic crust descends into the interior of the Earth beneath oceanic or continental crust at a convergent ''plate ''margin.
  
'''suture''' 1. A linear zone of continental collision, marking the site of a former ocean. 2. Line of junction of septum with conch wall in cephalopods.
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'''suture 1. '''A linear zone ofcontinental collision, marking the site ofa former ocean. 2. Line ofjunction of septum with conch wall in cephalopods.
  
'''syncline''' See '''''fold.'''''
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'''syncline ''See fold.'''''
  
 
'''tachylite '''Black, glassy rock formed by chilling of a '''''basaltic '''''lava or shallow '''''igneous '''''intrusion.
 
'''tachylite '''Black, glassy rock formed by chilling of a '''''basaltic '''''lava or shallow '''''igneous '''''intrusion.

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