Editing Northumbrian rocks and landscape: a field guide

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'''cyclothem '''A particular sequence of beds repeated again and again in vertical succession. Particularly notable in the Carboniferous (see '''''Yoredale).'''''
 
'''cyclothem '''A particular sequence of beds repeated again and again in vertical succession. Particularly notable in the Carboniferous (see '''''Yoredale).'''''
  
'''dacite '''Light-coloured, fine grained, volcanic rock of acid–intermediate composition.
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'''dacite '''Light-coloured, fine grained, volcanic rock of acid– intermediate composition.
  
 
'''deflation '''Erosion of land surfaces through the agency of wind.
 
'''deflation '''Erosion of land surfaces through the agency of wind.
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'''diopside '''CaMgSi<sub>2</sub>O<sub>6</sub> Pale, dirty green or grey silicate mineral of the '''''pyroxene '''''group, common in more basic igneous rocks. May form short prismatic crystals.
 
'''diopside '''CaMgSi<sub>2</sub>O<sub>6</sub> Pale, dirty green or grey silicate mineral of the '''''pyroxene '''''group, common in more basic igneous rocks. May form short prismatic crystals.
  
'''dip '''The maximum angle of inclination of a planar surface, usually bedding. Measured in the vertical plane at right angles to the '''''strike'''''.  
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'''dip '''The maximum angle of inclination of a planar surface, usually bedding. Measured in the vertical plane at right angles to the '''''strike. ''dolerite '''Dark coloured, medium-grained igneous rock of '''''basaltic''''' composition.
 
 
'''dolerite '''Dark coloured, medium-grained igneous rock of '''''basaltic''''' composition.
 
  
 
'''dolomite '''CaMg(CO<sub>3</sub>)<sub>2</sub> White, colourless, yellowish or brown mineral; rhombic crystals with curved faces. Term also used for the characteristically browny-yellow rock composed mainly of the mineral, but more correctly termed '''dolostone.'''
 
'''dolomite '''CaMg(CO<sub>3</sub>)<sub>2</sub> White, colourless, yellowish or brown mineral; rhombic crystals with curved faces. Term also used for the characteristically browny-yellow rock composed mainly of the mineral, but more correctly termed '''dolostone.'''
  
'''downthrow '''See '''''throw.'''''
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'''downthrow '''''See '''throw.'''''
 
 
'''draa '''A large sand ridge or dune chain, the largest desert landform.
 
  
'''drift '''Any superficial, unconsolidated sediments of the Quaternary.  
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'''draa '''A large sand ridge or dune chain, the largest desert landform. '''drift '''Any superficial, unconsolidated sediments of the Quaternary.  
  
 
'''drumlin '''Smooth, streamlined, oval mound of '''''till '''''(boulder clay), usually in groups (drumlin field or swarm), formed beneath an advancing ice sheet. The long axis of the drumlin is parallel to the direction of advance.
 
'''drumlin '''Smooth, streamlined, oval mound of '''''till '''''(boulder clay), usually in groups (drumlin field or swarm), formed beneath an advancing ice sheet. The long axis of the drumlin is parallel to the direction of advance.

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