378 



tain limerock" is rlistinguislied. This will best appear in the following 

 more extended notice. 



It occurs on the bank of Swan creek, at Newport, and in its bed for 

 the distance of two miles above, where to a small extent it has been 

 quarried for economical purposes. The stone is of dark, gray color. 



Stone of a similar character appears a mile northeast of Brest, (sec- 

 tion 24,) and has been quarried to a small amount. 



At Point au Peaux, it exhibits a vesicular or slightly oolitic structure 

 in the lower layers. Superimposed are four feet of disruptured masses 

 of a more compact character. 



Limerock appears in the bed and bank of Stony creek, at Brest, 

 where it has been penetrated to depth of four feet. The thickest stra- 

 tum opened was of three feet. It has a light, gray color, approaching 

 white. It is compact, and some portions silicious; considerable horn- 

 stone is contained. The stone is quarried in irregular, small blocks, suit- 

 ed to rough building. 



The ledge appearing at Stony Point, resembles in character the rock 

 on Swan Creek. It contains sulphate of strontian. 



Limerock forms the bed of Sandy Creek, at distance of two miles 

 from the Lake. 



The city of Monroe is underlayed by limerock at depth of from two 

 to five feet. The Jock is quarried to small extent in the bank of the 

 Raisin, near the city. Extensive quarries have been opened in the val- 

 ley of Plumb Creek, half a mile south of the city. The excavations 

 reach to the depth of nine feet. The succession of strata passed thro' 

 presents a variety of characters. The vesicular limestone observed at 

 Point au Peaux again appears associated with silicioas portions and 

 compact strata, variegated with yellowish and bluish spots and veins, 

 having the appearance of veined marble. These bear a tolerable polish, 

 and might serve for ornamental purposes. At depth of nine feet a stra- 

 tum occurs of dark blue color, and veined. 



The stone is said to improve with depth, both for lime and building 

 purposes. If this be the fact, it may be advisable to excavate lower 

 down the creek, where, owing to the direction of the dip, these more 

 valuable strata may be supposed to lie nearer the surface. 



The stone is mostly quarried in angular pieces of small dimensions, 



