GEOLOGICAL PAPERS. 105 



extending down to 42 T feet below the surface. From this bed 

 nineteen sample's were taken about five feet apart, and in more 

 than half the number of these samples Sporangites huronensc is 

 present. Some annelid denticles were also noted in one of these 

 samples, taken 313 feet below the surface. The two shales together 

 have a thickness of 261 feet. 



THE HENRY CITY WELL. 



From the old city well in Henry, made in 1886. in Marshall 

 Count}-, one sample of drillings was taken representing the strata 

 from 325 to 402 feet below the surface. A part of this sample 

 consists of shale belonging to the coal measures, which in this well 

 extend down from 130 to 325 feet below the surface. But the 

 greater part of the sample consists of a faintly brownish gray 

 shale, in which Sporangites huronense occurs in abundance. The 

 next sample taken below this represents the ground from 402 to 

 426 feet below the surface. This is mostly white, finely graular 

 limestone, probably Devonian. 



THE SCHUYLER OIL AXD GAS COMPAXY WELL. 



This well was made in 1909 on a farm belonging to Mr. W. B. 

 Manlove. in Birmingham township in Schuyler County, about 

 four miles southeast of the town of Plymouth. The ^lississippian 

 limestones in this boring continue down to 240 feet below the sur- 

 face and are underlain by 450 feet of shale. The description of the 

 samples from 246 to 683 feet below the surface is as below : 



Light shale, with fragments of limestone 246 



Light blue shale, with much pyrites in small crystals. Fragments of 



calcareous limestone frequent 280 



Light blue shale, with pyrites and calcareous fragments 293 



Light, greenish blue shale, with pyrites 295 



Light, greenish blue shale, with only infrequent cystals of pyrites 302 



Light, greenish blue shale. Xo pyrites noted 302 



Light, greenish blue shale 310 



Light, greenish blue shale 320 



Greenish gray shale, with poorly preserved specimens of Sporangites, 



occurring sparsely 330 



Greenish gray shale, with Sporangites ••..••..•• 340 



Greenish gray shale, with poorly preserved specimens of Sporangites. . 345 



Gray shale, faintly micaceous, with Sporangites ....•• 355 



Gray shale, with abundant Sporangites and occasional crystals of pyrites 365 



Gray shale, with Sporangites poorly preserved 400 



Light gray shale, micaceous, with comparatively thick specimens of 

 Sporangites, and shapeless fragments of resinous material which 



appear to be shreds of Sporangites 415 



Shale, almost black, showing reflections of minute scales of mica. A 

 highly bituminous rock which burns for a few moments after it 

 has been thoroughly ignited. On the split surfaces of some large 

 fragments several small specimens of Lingula were noted, abotrt 

 one millimeter in diameter. The distance from the umbo to the 



