.M'^'GEE — NOTES ON THE GEOLOGY OF MACON CO., MO. 319 



The next noteworthy exposure occurs in the river channel a 

 mile and a half south of Carbon ; and, in addition to the strata 

 laid bare by tlie river, large ovoid nodules, such as come from 

 the black shale above the coal, were scattered about, while, near 

 by, limestone resembling that above the coal at the Bengee and 

 Sherman workings crops out in the steep bluft" some 25 or 30 feet 

 above the Product us limestone. The combined exposures are 

 as follows : 



3. Salt Kivor Section. 



Feet. 



I. Massive, heavy-bedded limestone, magnesian in spots 3 



1. .Slope, with ovoid nodules exposed, about 27 



3. Slightly arenaceous shale or clay 2 



4. Firm massive limestone in one heavy and two discontinu- 

 ous thin ledges, containing abundant traces of brachio- 

 pods, and yielding a fine specimen of Productus cequicos- 

 tattis 2^ 



5. Argillaceous shale weathering into clay with abundant de- 

 tached valves ot Chonetes mesoloba 4 



6. Slope to bottom of channel 3 



41^ 

 Perhaps a mile farther down the river, and in the next westerly 

 bend, a similar exposure was observed in the river channel as 

 follows : 



Feet. 



1. Slope, passing down into arenaceous shale with "coal- 

 blossom" 5 



2. Produc/us-hQ&r\x\g limestone in a heavy ledge with one or 

 two thinner and discontinuous ledges 2 



3. Bluish argillaceous shale weathering into clay, with abun- 

 dant shells of Chonetes mesoloba 3 



4. Slope to bottom of channel 3 



The Sherman coal-working- is on a little stream falling into 

 Long branch, half or three-quarters of a mile above its confluence 

 with Salt river. There are several openings and a few natural 

 exposures, which, combined, afford an excellent section. 



3. Slierniaii .Section. 



Feet. 



1. Compact massive limes'tone, sometimes magnesian in 



spots and bands, discontinuously bedded ; without well 

 preserved fossils, but with many traces of shells 4^ 



2. Calcareo-argillaceous shale (sometimes absent) i 



