STATE GEOLOGIST. 99 



D. Sandstone, red, calcareous, highly shattered, breaking 



into cuneiform fragments, with conchoidal surfaces, 

 changing locally to O, 5 ft. 



C. Limestone, highly ferruginous, brecciated in places, 



containing nodules of chert. Passes upward into D. 4 ft. 



B. Limestone, quite arenaceous, brecciated,' shattered, 



with thin layers which are sandy and greenish ; the 

 whole exterior of some of the blocks covered with a 

 thick, loose coating of the same material ; upper 

 surface undulating, but smoothed as if by aqueous 

 action, before the superior layers were deposited, ... 2 ft. 



A. Limestone, compact, crystalline, silicious, bluish gray, 



with some crystals of dog-tooth spar. Exposed, ... 3 ft. 



The stratum D. is the parting layer between the upper and 

 lower portions of the formation. The characters of this bed 

 are exceedingly uniform at all the outcrops on the south and 

 west sides of the geological basin. 



At the quarry of C. Eoberts, S. E. J N. W. \ sec. 11, Spring 

 Arbor, is found a section similar to the preceding: 



D.'jSandstone, ferruginous, highly calcareous, breaking with 

 cunoidal fracture. 



C. Limestone, bluish-gray, hard crystalline, thick-bedded, 



of excellent quality, containing small crystal-lined 

 geodes, 5 ft 



B. Limestone, ragged, arenaceous, with irregular - seams 



and blotches of greenish sandstone, 2 ft. 



A. Limestone, fine grained, hard, bluish, 2 ft. 



This formation outcrops on sections 21, 26, 27, 28, 29, 31 

 and 32, in the township of Bellevue, Eaton county. Prom the 

 various quarries in the vicinity of the village, the following 

 succession of strata was made out: 



G. Limestone, thick-bedded, calcareous, 3 ft. 



F. Limestone, yellow, silicious, 2 ft. 



E. Limestone, massive, destitute of fossils, 6 ft. 



D. Belt filled with a casspitose Cyathophylloid, 6 in. 



0. Limestone, thick-bedded, containing Allorisma and a 



large coiled shell (not seen). 



B. Limestone, blue, compact, hard, thick-bedded, contain- 



ing geodes. 

 A. Sandstone, bluish-gray. 



From Leoni, in Jackson county, no actual oatcrop of this 



