192 bulletin: museltm of comparative zoology. ^ 



The analy.sis given in column 1 was from the glauconite sand at 

 Karya-Oro near Ontika, Esthonia, and 2 from the glauconite lime- 

 stone at the same place; 3 was from the glauconite limestone, and 4 

 from the glauconite sand, at Baitishport. 



For comparison, one may quote the following, the first two from 

 Clarke's Data of geochemistry, p. 494, and the other three from an 

 abstract of a paper by Glinka. (Zeitschr. kryst. u. min., 1898, 30, 

 p. 390). 



99.55 100.34 100.35 99.54 99.80 



The glauconite in column 1 is from a greensand marl, Hanover 

 Co., Virginia; 2 is the mean of four analyses of deep-sea deposits 

 from the Challenger Report; 3 is a glauconite from the Cretaceous 

 sandstone at Padi, Government of Saratow, Russia; 4 is from an 

 Eocene sandstone in the Urals; 5 from the Glauconite limestone at 

 Udriass, Esthonia. 



It will be noted that the Russian Ordovician glauconite contains 

 less iron, more alumina, much more magnesia, and more potash than 

 the other glauconites listed. 



Kunda formation. Bj,, (Vaginatenkalk) of Schmidt; Bm^g and 

 B,ii.y of Lamansky. 



This well-known formation may be seen throughout the whole 

 extent of the Ordovician from the Sjass to the Island Rogo, off Baitish- 

 port, but is best exposed in Esthonia. I have selected Kunda as the 

 type-section because it is there well exposed and richly fossiliferous. 

 A drain recently dug by the Cement Company at the extensive 

 quarries about three miles south of Port Kunda on their private rail- 

 road exhibits a complete section of the formation, which is here fifteen 

 feet thick. A large quarry, opened during the summer of 1914 will. 



