CA RB OAUFER O US A ND PERM I A N FORMA TIONS I 7 1 



SECTION OF CAPTAIN HOOVER "FIRE CLAY " QUARRY. 



Feet. 



7. Soil containing bowlders of hard, dark brown Dakota sandstone i = 53 



6. Light brown to rusty brown color friable sandstone with 

 streaks of iron brown. In the upper part, some of the 

 hard, dark brown sandstone (line of irregular bedding) - 14 =: 52 



5. Brownish friable sandstone, six inches to two and one-half 

 feet thick, the difference in thickness being due to the 

 irregular line limiting the top of this stratum - - - 2;^^ = 38 



4. Very hard dark brown sandstone - - - - - y^-\- =i T^z^y^ 



3. Brown conglomerate with plenty of small pebbles of quartz, 



flint, etc. - - - - - - - - - i< = 35 



2. Somewhat arenaceous fire clay of light gray to almost white 

 color with pinkish layers. Some layers of friable light 

 gray to whitish sandstone ; also of brownish yellow color. 

 About fifteen feet of this part of the section used for fire 

 clay 30 = 34;^ 



I. Yellowish, very soft and friable sandstone with dark brown 



streaks (bottom of exposure below the quarry) - i ^ 14 z= i^y 



In the Other quarry of Captain Hoover (Sec. 23, Tp. 12, 

 Range 1 1 ) the Dakota sandstone has been quarried and used to 

 a considerable extent in the village buildings. The stone out of 

 which Captain Hoover's house was built some thirty years ago 

 has hardened somewhat on exposure, and in many of the blocks 

 the marks of the tools used in dressing may still be seen. 

 According to the Captain there is about twenty feet of this 

 dark brown sandstone that may be quarried. It is interesting 

 to note the difference in consolidation of the same layers of the 

 Dakota sandstone when separated by only a short distance. The 

 Hoov^er quarries are only about one-half mile apart and still the 

 comparatively massive brown quarry sandstone just described is 

 the same stratum as the friable light brown sandstone, No. 6, of 

 the "Fire Clay" quarry. 



Below the sandstone on section 23 is from fifteen to twenty 

 feet of the light gray to pinkish fire cla3\ The clay from both 

 of these quarries is made into pottery and is also used in Union 

 Pacific foundry shops and for crucibles and the lining of retorts 

 in smelters. A considerable amount of it is shipped to Omaha 

 for use in the gold and silver smelters. Samples were shown me 



