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Plate II. Photographs of fossil imprints of ice crystals on flags of 

 the Eagle Ford. The upper rock shown in the Plate is from the 

 south side of Cuesta Blanca in Brewster County, Texas, and shows 

 casts of crystals which represent fillings of sandy mud projecting 

 slightly down into an underlying bed of more argillaceous material. 

 The lower part of the figure shows a similarly marked flag from 

 the same formation at a point about five miles north of the old 

 Boquillas postofiice near Tornillo Creek, east of the Chiscs Moun- 

 tains, in Texas. Here are seen the original grooves made by the 

 ice on a layer of muddy material later buried. Slightly reduced. 



