EXPLANATION OF PLATE 4 



Minor pseudostrata and pseudolaminae. Tinaquaic grant. 



Fig. 1, — Lamination approximately parallel to canon slope. Narrow 

 and more prominently weathering separating layers chiefly of silica. True 

 dip away from observer (north, 8°). Dip of pseudolamination, east 30°. 



Fig. 2. — Same locality, showing pseudostratification planes as planes of 

 separation. 



[34] 



