EXPLANATION OF PLATE 6 



Sand pendants and minor stratum. 



Fig. 1. — Sections, of sand pendants split longitudinally and broken 

 transversely. The inner light portion is chiefly hydrous silica, the outer 

 dark portion, sand cemented by silica. The central hole is seen in the 

 lower transverse sections and in part in the upper right-hand longitudinal 

 section. Natural size. 



Fig. 2. — Portions of sand pendants to show outer surface and general 

 form. None show complete length. Natural size. 



Fig. 3. — Separated layer from exposure shown in plate 4, figure 2. The 

 white edges of the secondary silica layers are well shown. The upper 

 surface is coated with such a layer showing ramifying channels as if 

 impressions of plant rootlets. Joint planes transverse to layers are also 

 coated with silica. One newly developing crack is shown on left side, and 

 its walls are also coated with silica. The light colored blotches are due 

 to varying amount of hydrous oxide of iron. It is disposed in bands 

 parallel to the layer surfaces and also in irregular areas determined by 

 the concretionary type of deposition. % natural size. 



[38] 



