426 University of Kansas Geological Survey. 



on such insufficient grounds as slight differences in shell com- 

 position. His opinion is expressed in the following words : 

 " Those who have been engaged in the laborious task of throw- 

 ing light upon the nomenclature of this class, may in many- 

 instances have been struck at finding their list of synonyms 

 swelled to hundreds by different names having been conferred 

 on forms without even varietal distinction, founded upon quite 

 accidental or individual diversity, or on no differentiating char- 

 acters whatever." 



The real chalk from the Pteranodon beds bears a close resem- 

 blance to the English variety, but has fewer and better pre- 

 served remains. Here the Textularia globulosa and Globigerina 

 bulloides abound, but no trace of G. spinosa is apparent. The 

 forms are beautifully preserved and show every detail of their 

 structure. The matrix is, to a great extent, composed of Coc- 

 coliths and Rhabdoliths. Crystals of calcite fill most of the 

 tests. Aside from the color, therefore, the chalk from the 

 Hesperornis and Rudistes beds of Kansas may be said to differ 

 but little from the true English chalk. 



From the Inoceramus beds, hardly as clear an indication of 

 the organic origin was obtained as from the others. Instead of 

 the clearly marked shells of the Foraminifera are found regular 

 spaces filled with a crystalline deposit. These, however, are 

 of such a character as to lead to the belief that the rocks were 

 originally made up, to a considerable extent, of Textularian 

 and Globigerine remains, which, at a later time, became re- 

 placed by obliterating crystalline deposits. Occasional well- 

 preserved remains are found and their appearance lends support 

 to the opinion just expressed. 



Specimens from the Fort Hays beds, as represented by rocks 

 from Coolidge, are found to contain comparatively few organic 

 remains, the matrix constituting the greater part of the bulk. 

 Globigerina spinosa appears most prominently, while G. bulloides 

 is absent. A few Textularise globulosas may be found. 



Perhaps the most remarkable of any of the rocks are those 

 that come from the Lincoln marble deposits. On examination 

 these are found to consist almost exclusively of Foraminiferal 



