284 E. a. BKANs'iso^ — THICK avrtsL M a:sd salt j)eposits 



FiGURic 1. — Idealized Section of (lyiisinii lu-dx 

 To show relation of 20-foot: beds of gypsum to 10-foot beds jis they ncciir near Lander. 

 Wyoming. Scale, 1 inch to 1.200 feet. Gypsum bed between (he black lines bounding 

 the stippled ai'eas. 



FiGUHE 2. — Idealised Section of Gi/pfudii lieds 

 To show relation of 40-foot beds of gypsum to 1.5-foot beds as they occur near I,anrtcr, 

 Wyoming. Scale, 1 inch to 1,200 feet. Gypsum bed' between the blaciv lines bounding 

 I he stippled areas. 



Figure 3. — Idealized Section of Gypsum Beds drawn to Scale 

 To show relation of 20-foot beds of gypsum to 10-foot beds if the deposits originate 

 from direct precipitation from waters five times as concentrated as normal sea-water. 

 Scale, 1 inch to 1.200 feet. The receiving basin would have slopes of 50° or greater. 

 Gypsum bed between the lower lines. The 20-foot bed is at .3, about 3,000 feet below 

 the 10-foot bed, into which it grades at the upper corners of the diagram. 



Figure 4. — Idealized Section of Gypsum Beds drawn to Scale 

 To show relation of 40-foot beds of gypsum to 10-foot beds if the deposits originate 



from direct precipitation from waters five times as concentrated as normal sea-water. 



Scale, 1 inch to 5,000 feet. Gypsum represented by the heavy black line. 



The diagrams illustrate the impossibility of thick deposits, in continuous beds with 



thin deposits, originating from direct precipitation without lateral shifting of the gj-psum 



along the bottom. In diagrams 3 and 4 the space between the stippled, horizontal bed 



and the gypsum bed represents sandstone. 



