314 GEOLOGY. 



bly owing to the presence of greater or less quantities of carbonate 

 of magnesia, and a little alumina. In some sections the hydraulic 

 limestone is of very good quality. At Beatrice its manufacture was 

 for some time conducted, but owing to various causes it has been 

 temporarily suspended. All the work done with this cement has 

 stood the test of time. Owing to inadequate appliances it was not 

 sufficiently pulverized, but that defect will be remedied when its 

 manufacture will be resumed. This will probably be done during 

 the coming season. Sooner or later it must become an important 

 industry of the place and the State. 



Btick Clay of good quality exists in every part of the State. The 

 Loess deposits which are so widely distributed over the State fur- 

 nish it in abundance. The only precaution needed is to select it 

 where there are no concretions of lime. Beneath the Loess and 

 the adjoining drift in many places is a greater or less thickness of 

 clay of glacial age that makes first-class brick. There are also oc- 

 casional strata in the alluviums of the river bottoms that furnish 

 brick clay in abundance. 



Fire Clay is also abundant. It underlies and sometimes overlies 

 the thin beds of coal in southeastern Nebraska, and is found at long 

 intervals in other sections of the State. 



Potters' 1 Clay is occasionally found in the alluvium. Informer 

 years a bed was worked on the Missouri bottom, east of Dakota 

 City. The best now known or worked is located at Louisville, in 

 Cass County. The following is a section: 



1 . Loess 3 feet. 



2. Red rock ; Dakota Group 2 to 3 " 



3. Potters' clay, of greyish white color, with streaks of pure white 



sand from one to eight inches thick 20 " 



The bottom of this clay has not yet been reached. Three miles 

 cast of this bed another occurs of which the following is a section: 



1 . Black soil 2 feet. 



2. Bluish potters' clay with lime concretions towards the top 12 " 



One mile and a half northeast of the first another bed occurs. The 

 following is a section: 



1. Black soil 5 inches* 



2. Reddish earth 18 " 



3. Potters' clay, exposed 6 feet. 



