Editing Yorkshire rocks and landscape: a field guide

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'''selenite '''''See '''''gypsum.'''
 
'''selenite '''''See '''''gypsum.'''
  
'''septarian '''Nodules or concretions with a series of internal mineral-filled (usually '''calcite''') cracks.
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'''septarian '''Nodules or concretions with a series ofinternal mineral-filled (usually '''calcite) '''cracks.
  
 
'''siderite '''FeCO<sub>3</sub> Grey to grey-brown mineral widespread in certain sedimentary rocks, particularly sedimentary ironstone deposits and Coal Measures sequences.
 
'''siderite '''FeCO<sub>3</sub> Grey to grey-brown mineral widespread in certain sedimentary rocks, particularly sedimentary ironstone deposits and Coal Measures sequences.
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'''sole structure '''Sedimentary structure cut into an underlying mudstone by a turbidity current and infilled by the overlying '''turbidite '''bed. Preserved as a cast on the base of the turbidite. '''Flute cast (mark): '''ovoid scoop-shaped structure caused by turbulent water flow, preserved as a lobe on the base of the turbidite.
 
'''sole structure '''Sedimentary structure cut into an underlying mudstone by a turbidity current and infilled by the overlying '''turbidite '''bed. Preserved as a cast on the base of the turbidite. '''Flute cast (mark): '''ovoid scoop-shaped structure caused by turbulent water flow, preserved as a lobe on the base of the turbidite.
  
'''solifluction '''Downhill movement of surface layer of unconsolidated weathered material when saturated by water.
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'''solifluction '''Downhill movement ofsurface layer ofunconsolidated weathered material when saturated by water.
  
'''sphalerite (blende) '''ZnS Commonly a brown or black mineral with a resinous lustre and variable form. Most common ore for zinc.  
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'''sphalerite (blende) '''ZnS Commonly a brown or black mineral with a resinous lustre and variable form. Most common ore for zinc. '''spillway '''General term for '''meltwater '''or '''overflow channels.'''
 
 
'''spillway '''General term for '''meltwater '''or '''overflow channels.'''
 
  
 
'''sponge '''Primitive invertebrates with an often asymmetrical body supported by spongin and/or siliceous or calcareous spicules.  
 
'''sponge '''Primitive invertebrates with an often asymmetrical body supported by spongin and/or siliceous or calcareous spicules.  

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