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S^dimentary^ rocks — Deposited from water. 



Septaria — calcareous concretions, divided by irregular lines of carbonate of 

 lime into septa or chambers. 



Siphuncle — A tube passing through the septa of concamerated shells, to enable 

 the animals to rise and sink in the water. 



Stratum — a bed or deposite distinct from another bed. 



Stratified — deposites formed by beds lying upon and usually parallel to each 

 other. 



Strike — the direction of the edges of beds at right angles to their dip, as we 



say to strike off in any given direction- 

 Synclinal-^where the beds converge towards each other in concave lines. 

 Talus — a slope at the foot of an escarpment, formed of the fallen materials. 

 Unconformable — beds whose planes do not conform in parallelism to each other»- 

 £fw5ira/i/2ef/-— amorphous masses, without any appearance of stratification- 

 Zoophytes— 'SLnimsih producing coral rocks. 



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