658 W. H. SHERZER — -RECOGNITION OF TYPES OF SAND GRAINS 



Plate 44. — Types of Sand Grains 



Figure 1. — Aqueous Sand, Mouth of tlie Tiber, Italy. (X 20i/4.) 



Granules assorted; fresli, angular, but with corners and edges 

 rounded. Various composition. Collected by Prof. B. L. D'Ooge. 

 By reflected light. 



Figure 2. — Aqueous Sand, Shore of Lake Huron, Kincardine, Ontario. 

 (X 201/2.) 



Very similar to figure 1. Collected by Prof. M. S. W. Jefferson. 

 Reflected light. 



Figure 3. — Aqueous Sa)ul, Atlantic Coast, Marthas Vineyard, Massachusetts. 



(x2oy2.) 



Granules fresh and subangular, but more rounded than figures 

 1 and 2. Collected by Prof. M. S. W. Jefferson. Reflected light. 



Figure 4. — Aqueous Sand, Atlantic Coast, West Palm Beach, Florida. 

 (X 201/0.) 



Granules ^yell assorted ; pure, crystalline quartz ; much worn, 

 but still subangular. Extreme type of aqueous sand. Supplied 

 by E. E. Free, U. S. Bureau of Agriculture. Reflected light. 



Figure 5. — Aqueous Sand, shore of Lake Michigan, Holland, Michigan. 



(X 201/0.) 



Coarse, fresh, well assorted as to size; varied composition. All 

 granules show erosion, the two well rounded ones below the cen- 

 ter having probably been exposed to wind action as well as water. 

 Collected by Prof. M. S. W. Jefferson. Reflected light. 



Figure 6. — ^Eolo-aqueous SuMype of Sand, from Dune, Holland, Michigan 

 {near Figure 5 Sample). (X 20%.) 



An aqueous type of sand being modified by the wind. Note the 

 character of the bean-shaped granule just southeast of the center. 

 Collected by Prof. M. S. W. Jefferson. Reflected light. 



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