I98 NEW YORK STATE MUSEUM 



might be expected. Unlike the manganese, titanum shows a very 

 limited range, in quantity, in five out of the six samples analysed. 



The determinations of BaO and SrO were made in an attempt to 

 get evidence as to the first stage of concentration of these oxides 

 which occur somewhat frequently in Clinton rocks as aggregates 

 of celestite and strontianite, containing barium. 1 



As a matter of fact, the average content of BaO, 0.016, indicates 

 dilution rather than concentration while, on the other hand, SrO, 

 with an average amount of 0.08, shows slight concentration, but 

 no long step toward the segregated minerals. As the latter usually 

 occur near the horizon of the " fossil ore," no. 6, it is rather sur- 

 prising to find no greater concentration of SrO in this rock than in 

 no. 2, many feet lower down. 



In analyses numbers 5 and 6, the results for all the minor con- 

 stituents are probably affected by the manner of preparing the 

 samples, as was pointed out with reference to the small content 

 of P2O5 in comparison with the amount commonly present in Clinton 

 ores. 



1 Chester, A. H., Mineralogical Notes from the Laboratory of Hamilton Col- 

 ege, Am. Jour. Sci. (3) XXXIII, 1887, p. 284-91. 



