ART. 16 CAVE PEARLS FROM NEW MEXICO — HESS 5 



Plate 4 



Section of a phosphate rock from Wyoming, showing oolitic structures. In one 

 instance a fish tooth forms the nucleus of an oolite. 



Plate 5 



Figs. 1 and 2. Elongated oolites from the Rookery. The one at the right sliced 

 and showing a nucleus of a broken stalactite. 

 3. Section of an oolite of nickel formed by accretion from decomposing 

 nickel carbonyl. 



Plate 6 



FiQ. 1. Hailstones showing concentric structure. 



2. Oolite from cave showing a similar concentric structure. 



Plates 7 and 8 

 Oolites of varying shapes formed under varying conditions. 



O.B. OOVaBNMBNT PBINTIiSO OFFICII: 1929 



