26 LOWER PENINSULA. 



vosites turbinatus, Fav. hcmisphcricus, various species of Fenes- 

 tella and Polypora, Stictopora Gilbcrti, Stromatopora textilis, 

 Atrypa reticularis, Spirifer acuminatus, Strophodonta concava, 

 Strophod. perplana, Orthis Livia, Lucina elliptica, Conocardium 

 trigonale, Euomphalus Dekewyi, various large forms of Orthoceras, 

 Gomphoceras, Gyroceras, Nautilus, Phacops bufo, Proetus crassi- 

 marginatus, Dalmania selenurus, and bones of fishes. 



The base of the part of the quarries at present worked is formed 

 of about 4 feet of very uneven, thin-bedded, concretionary lime- 

 stones full of hornstone nodules, and coated over by a black, shin- 

 ing crust of bituminous shale ; the peculiar segregations called stylo- 

 lites are also quite frequent in these beds, which (beds) are thrown 

 away as worthless rubbish. Under them, in another part of the quar- 

 ry, not now worked, are other limestone beds denuded to the depth 

 of 12 feet; several of their thicker seams furnish material quite 

 as good as the best ledges in the upper part of the quarry. The 

 owner of the place bored in the quarry a drill hole through solid 

 limestone for a depth of 6o feet, in search of well-water, but 

 did not succeed in finding any. Selected blocks of the lime rock 

 are cut into door-steps, sills, water-tanks, etc., the rest being used 

 for foundation walls and for the lime-kilns. An analysis of the 

 principal quarry stone gave : 



Carbonate of lime 87.5 



" " magnesia 10. i 



Quartz ore residue, besides small quantities of 

 iron and alumina 2.0 



99.6 



The quarries on Macon Creek, on Mr. Christiancy's former prop- 

 erty, are opened in the same strata as the Trenton quarries. The 

 rock there is more porous, absorbing water rapidly when dry, and 

 considerably impregnated with rock oil, which exudes from its 

 crevices, and often collects on the water pools of the quarry in a 

 thick scum. In humid state, the rock is dusky drab-colored. The 

 surface layers are rich in fossils identical with those of the Tren- 

 ton quarries ; certain seams are perfectly crowded with Chonetes 

 yandellana, and others with Tentaculites scalaris. Below these 

 fossiliferous beds, the useful ledges of the quarry, about 6 or 

 7 feet in thickness, follow ; they are of the above-mentioned 



