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Indiana University Studies 



ward at a very slight angle from the east to the two main 

 openings. The slope toward these openings from the west is 

 somewhat greater, but is still at a low angle. The latter slope 

 is the surface of the outwash plain which consists mostly of 

 sand. The most fertile land of the region is in this sandy 

 eastward slope. The present stream of Bridge Creek has a 

 poorly marked valley some 12 feet below the general level 

 of the lake flat where the stream flows into the opening in 

 the sandstone bluff. The second largest opening, a quarter 

 of a mile to the west, is entered by a stream flowing in a 

 slightly depressed swail (see Fig. 7). The two small open- 



Vu\. i. C;i\i'-iiik'l ul' the stream oiie-foiirtli mile west ol' where the 

 Bridge Creek ^yaters become subterranean. 



ings in the southern half of the southeast quarter of sec- 

 tion 26 have independent streams both of which are de- 

 pressed more sharply below the general level of the lake flat 

 (see the topographic map).. In the northeast quarter of sec- 

 tion 26 are several small sinks which have their surface ex- 

 pression in the joints of the massive Cypress sandstone. There 

 are several similar sinks in section 24. Some of these are 

 of more than passing interest on account of being on the 

 ''nose" of Cypress sandstone in the southeast quarter of the 

 section. Several small ones here reach down some 40 feet, 

 thru the whole thickness of the Cypress sandstone before 

 coming to the Beech Creek limestone. These sinks show the 



