M'^GKE NOTES ON THE GEOLOGY OK MACON CO., MO. 325 



3- Coal : 5 



4. Clay and slope, about 5 



5. Brown ferruginous dolomite with peculiar vertical mark- 

 ings probably formed hy a coral now completely dissolved 2 



6 Light gray heavy-bedded limestone with conchoidal frac- 

 ture, sometimes argillaceous with shaly partings, some- 

 times dolomitic in spots and bands, with no good fossils 

 but many obscure traces of shells and corals 3 



7. Light blue shale rapidly breaking down into clay with 

 abundant detached valves of Chonetes mesoloba 11 



31 

 The section extends to the bottom of the channel of Claybank 

 creek, immediately below the bridge. The coal is best exposed 

 in two workings, an eighth and a quarter of a mile farther west 

 respectively ; but it is also seen in its proper place in the road. 

 It is noteworthy that in the half or three-quarters of a mile of 

 more or less imperfect exposures combined in this section there is 

 a westward inclination of not less than 30 or 40 feet. 



Exposures on the Hauii. d- St. yos. Raihvay. — Some three- 

 quarters of a mile east of Macon there is an abandoned coal-work- 

 ing, near the lower brick-yard, in which the coal appears to have 

 been obtained only a few feet below the surface ; and about a 

 quarter of a mile farther east, and at a somewhat lower level, a 

 few ledges of rock dipping gently eastward are exposed in the 

 dry channel of the stream below the railroad bridge. The strata 

 appear to fall into the following arrangement : 



13. I^ower Uriok-yarcl Section. 



Feet. 



1. Gray shale or clay 2 



2. Slope \\ 



3. Evenly-bedded limebtone li 



4. Hiatus, probably about 2 



5. Coal ' ? 



7 

 At Bevier the coal-workings are of great extent and import- 

 ance, yet little rock is exposed. In the channel of the creek 

 near the depot there appears a rather friable sandstone, frequently 

 nodular and irregular, sometimes cavernous and intersected by 

 peculiar shrinkage crevices recalling the interior structure of 

 locss-kiiidchen, though the scale is much larger; and the cement, 



