SEDIMENT Solid fragmented material (sand, gravel, silt, etc.) transported 

 by wind, water, or ice or chemically precipitated from solution or secreted 

 by organisms. 



SEISMOGRAPH An instrument that records elastic waves in the ground 

 produced by earthquakes, explosions, landslides, or ocean waves. 



SELECTIVE SORTING A process occurring during sediment transport that 

 tends to separate particles according to their size, density, and shape. 



SHOREFACE A seaward-sloping ramp, seaward of the low water line that 

 leads to the inner continental shelf and is characteristically steeper than the 

 shelf floor (Figure A-l). 



SHORELINE The line of demarcation between a shore and the water. May 

 fluctuate periodically due to tide or winds. 



SOIL Unconsolidated sediments which contain nutrients, organic matter, 

 etc., and serve as a medium for the growth of land plants. 



SPIT An elongated, usually sandy, feature aligned parallel to the coast that 

 terminates in open water (Figure 2). 



STRAND PLAIN A prograded shore built seawards by waves and currents 

 (Figure 3). 



SUBTIDAL Below the low water datum; thus, permanently submerged. 



TEPHRA Clastic materials ejected from a volcano and transported through 

 the air. 



TEPHROCHRONOLOGY The collection, description, and dating of tephra. 



THERMOLUMINESCENCE The property displayed by many minerals of 

 emitting light when heated. 



TIDAL CREEK A creek draining back-barrier areas with a current 

 generated by the rise and fall of the tide. 



TIDAL SHOALS Shoals that accumulate near inlets due to the transport of 

 sediments by tidal currents associated with the inlet (Figure 2). 



TILT Sideways inclination of an aircraft or spaceship. 



UPDRIFT The direction along a coast from which littoral drift material is 

 moving. 



VARVE A sedimentary lamina or set of laminae deposited in a body of still 

 water in a year's time. 



A4 



Appendix A 



