330 TRANS. ST. LOUIS ACAD. SriEXCE. 



3. Thinl}' and regularly laminated black fissile i-hale. con- 

 taining ovoid nodules 5 



4. Coal 2 



5. Fire-clay 4 



The workable coal is barely 2 feet — ii^enerally running from 22 

 to 23 inches. The base of this section is 2 or 3 feet above the 

 bottom of the ravine, and perhaps 25 feet above the bottom of the 

 river-channel. 



A number of coincident exposures were observed on Long 

 branch within a mile from its mouth ; and a mile farther south- 

 ward there is an exposure of J-'roductus-hearing limestone in the 

 bottom of the river channel, the associated beds being invisible. 



The next important exposure is at Hunt's coal-working, some 

 2 miles below the mouth of Long branch. The following section 

 is made up of a natural exposure in the stream channel, which 

 there hugs the western side of the valley, and the artificial expo- 

 sure of the working a few yards distant. The lowest member 

 was only seen in an excavation in the channel bottom. 



4. Hunt Neetioii. 



Feet. 



1. Slope, witii a few fragments of limestone 5 



2. Bright black fissile shale, with ovoid nodules 4 



3. Coal, about 2 



4. Fire-clay passing down into slope 12 



5. Calcareo-arenacfous shale, locally lithified 10 



6. Slope 2 



7. Irregularly bedded knobby limestone with abundant shells 



oi Productus, etc 2 



S. Incoherent argillaceous shale 2 



39 

 The absence of the limestone stratum commonly overlying the 

 black shale is remarkable, since it ordinarily forms the verge of 

 the escarpment in which this coal-seam occurs and in which the 

 openings are located. 



The coal-workings from which Carbon was named are now 

 abandoned, and the strata there are no longer well exposed. 



Ex^osiires on East Fork. — Th'e most northerly outcrop ob- 

 served is on the land of W. H. Payson, Esq., some zh miles north- 

 west of Macon, in a ravine perhaps a quarter of a mile east of and 

 40 or 50 ft. above East Fork. It is supplemented by coincident 



J 



