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''' | + | '''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 | + | '''strike '''Intersection ofa bedding plane, or other planar surface, with the horizontal. |
− | '''strike-slip | + | '''strike-slip ''See fault.''''' |
− | '''stromatolite '''A carbonate rock with a fine horizontal, domal or columnar banding, reflecting the control | + | '''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 | + | '''subduction '''The process whereby oceanic crust descends into the interior of the Earth beneath oceanic or continental crust at a convergent ''plate ''margin. |
− | '''suture''' | + | '''suture 1. '''A linear zone ofcontinental collision, marking the site ofa former ocean. 2. Line ofjunction of septum with conch wall in cephalopods. |
− | '''syncline | + | '''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. |