STATE GEOLOGIST, 95 



<■, without undergoing important ch 

 from its original character. Especially are we unable to decide 

 I i khe whole probable thickness of the 

 wives of Lake Buren have for egos 

 been breaking against the exposed edges of the strata, and the 

 isarily been dissolved out to ■ considerable 

 d the shore. In confirmation of this inference 

 I found si Pointy one mile north of the north Line of Hay 



county, numerous "sink h< - if produced by the Bubsi- 



'lying beds, after the dissolving out of the 

 i 9 ui<? of these are eight feet deep. Water is stand- 

 • them, probably at the Level of the lake. The sides are 

 l -tly as if the recks bad sunken. In «>nc place a sink 

 sn pursuing an irregular conn reral reds, toward 



the lake, and the wh^l,' appearance is exactly such as is pro- 

 duced by the falling in of the roof of a miner's "drift.'' Off 

 this point, in calm water, the bed of the lake is seen to be a 

 -if pure whits gypsum — the same, undoubtedly, which 

 above the surface at Plaster Hluff half-a mile further north. 

 The laud, back from the shore of Tawas Bay, rises in a suc- 

 d oi ridges running parallel with the lake. About 12 

 miles back, in the vicinity of the A.U <ms river, the country 

 broken, resembling that upon Grand River in the 

 vicinity of the gypsum quarries. At the residence of Sherman 

 ler, 41 miles south Of Tawas City, one of the parallel 

 - attained an elevation of 40 feet, and the acclivity 

 _ the lake presents s slope of 30" with the horiaon. This 

 ridge is said to increase in height as far north M the Tawas 

 River. Mr. Wheeler informed me that no explorations had 



ever been made in this bluff, except to a limited extent b\ Mr 

 ChalK ; , -a were found, called clay by Mr. Wheeler, though 



■hown me was the brown limestone of the Michi- 

 gan Salt Group, as seen at Plaster Bluff The green ttreaki in 

 it were pmnounced by Mr. Challis to be indications of the 

 proximity I J was also prophesied in this rid 



Arriving at Tawas city, I obtained some further information 



