18 UNIVERSITY OF MISSOURI STUDIES 



Dolomite, pink, medium-grained, weathers to a very rough, 



pitted surface 1 ft. 3 in. 



Dolomite, gray, porous, dense, medium -grained 6 in. 



Dolomite, gray, thin-bedded, weathers rough and nodular, 



rather argillaceous 1 ft. 6 in. 



Dolomite, yellowish-gray, medium-grained, weathers to a very 



rough pitted surface 2 ft. 



Dolomite, buff colored, weathers dark gray; fine to medium- 

 grained; thin bedded, beds up to 6 inches in thickness; 

 some beds contain scattered grains of glauconite; others 

 contain small grains of purite; some beds are porous 18 ft. 



Dolomite, fine-grained, dense, tough, weathers yellow, surface 



weathers gray 8 ft. 



Slope covered by talus 40 ft. 



The striking feature of the Davis member is the abundance 

 of edgewise and intraformational conglomerates (only one of 

 these is really an edgewise conglomerate) in its lower part. 

 Buckley recognized fifteen of these conglomerate beds in the sec- 

 tion of the Davis formation in the "Lead Belt," but the number 

 in this area is unknown because of the limited outcrops of this 

 part of the formation. There are seven or eight of them in the 

 lower 80 feet of the formation. The "edgewise" conglomerates 

 are interbedded with the same kind of materials of which they 

 are composed, thus proving them to be intraformational con- 

 glomerates as noted above. 



The dolomites of this lower part range in texture from fine 

 to medium-grained. The fine-grained ones are very dense and 

 tough, and break with a rudely conchoidal fracture as a rule. 

 Most of them are medium-grained and distinctly granular. The 

 colors are usually light shades of gray, but with pinkish and 

 greenish phases. The weathered rock usually assumes a buff, 

 grayish, or yellowish color. 



The accessory minerals of the dolomite are calcite, quartz, 

 glauconite, iron, pyrite (in small nodules), a few grains of 

 galena, and clay. The glauconite is more abundant in the shaly, 

 sandy portions near the lower part of the section. 



The dolomite contains calcite (sometimes in areas up to one 

 and one-half inches across) which weathers faster than the 

 dolomite, thus giving the rock a pitted surface. The calcite crys- 



