Oolith: Spheroidal bodies with nucleus or central mass enclosed by one 

 or more surrounding layers of the same or different material ; may be any color 

 and of many kinds of material, generally less than 1.0 mm in diameter. Those 

 over 2.0 mm are pisoliths. 



Concentric: Peripheral layers around a small, undetermined 

 nucleus. 



Clustered: Attached ooliths without solid matrix. 

 Drusy: Oolith covered with subhedral quartz; may be free or 

 clustered. 



Free: Unattached oolith. 



Massive: Interior of granular, smooth, or chalk-textured material 

 comprising nearly the entire mass of the spheroid. 



Radiate: Fibers radiating from small or large nucleus; may have 

 several peripheral layers. 



Sand-centered: Nucleus, a quartz sand grain. 

 Oomold: Spheroidal opening representing the former presence 

 of ooliths. 

 Oomoldic: Containing oomolds. 



Skeletal with oomolds: Same definition as for "dolomoldic." 

 Abundant oomolds: Same definition as for "dolomoldic." 

 Scattered oomolds: Same definition as for "dolomoldic." 

 Ordinary: Smooth chert with even fracture surface; all colors, chiefly 

 white, gray, or brown; may be mottled; approaches opaque; generally homo- 

 geneous, but may have slight evidence of granularity or crystallinity ; grades 

 into chalcedonic or granular chert. 



Porcelaneous : Chert with smooth fracture surface; hard; opaque to sub- 

 translucent; typically china-white resembling chinaware or glazed porcelain; 

 grades to chalky. 



Pseudoolithic: Rounded pellets with no peripheral layers or sharp dis- 

 tinction between pellets and matrix. 



Pyrimolds : Cavities left after the removal of euhedral pyrite by weathering 

 or otherwise. 



Quartz: Clear, colorless quartz; not detrital. 

 Radiate: See "oolith." 



Regenerated: Used in reference to quartz sand grains with secondary re- 

 growth of crystal faces oriented with the original axis of the grain. 



Rounded: Spheroidal or ellipsoidal sand grains, coarse to fine, may be 

 polished, frosted, or etched. 



Sand: Grains of sand size, chiefly quartz, but may be composed entirely or 

 partly of other minerals. 



Sand-centered: See "oolith." 



Scattered: See "dolomoldic" and "oomoldic." 



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