GEOLOGICAL LOCALITIES. 17 



138. Caucasus. Various specimens of compact black limestone, taking high 

 polish, and containing Fusulina;. A knowledge of the contents of these 

 can only be obtained by means of thin sections, the list is therefore 

 necessarily incomplete. I am not quite certain that I am right in classing 

 them as Russian. Some of the specimens contain the Fustduia sphcerica 

 of Abich, which suggests the possibility of these at least being from the 

 Armenian or northern Persian portion of the mountain range. 



NORTH AMERICA. Table VI. 

 UNITED STATES AND CANADA. 



Beyond the genus Fusulina but little is yet known concerning the Carboniferous 

 Foraminifera of North America, and the instalment now offered towards the history Q 

 the minuter forms is not of sufficient importance to need any lengthy geological introduc- 

 tion. The American Fusulina-rocks pertain chiefly to the "Upper Coal-measures," but 

 in the South-western States they extend into the strata which arc regarded as represen- 

 tative of the Permian system ; indeed, the largest variety of the genus hitherto described 

 (Fusulina donyata, Shumard) has its habitat in the Permian Limestones of Texas and 

 New Mexico. 



Only two samples of material from the Fusulina-beds, in condition favorable for 

 examination with respect to the smaller Foraminifera, have come under my notice, and 

 both of them Avere from Iowa. They were forwarded to me by Dr. C. A. White, 

 whose effective labours in connection with the geology of that State are well known. 



I am indebted to Dr. F. B. Meek and Dr. C. A. White, of Washington, for 

 interesting specimens of a microzoic limestone of much earlier age from the " Sub- 

 carboniferous " rocks of Indiana, consisting almost entirely of the shells of a single 

 species of Foraminifer, Endothyra Uowmani, Phillips (Rotalia Baileyi, Hall). 



With respect to the single Canadian locality, I can add nothing to the published 

 statement in my friend Dr. J. W. Dawson's 'Acadian Geology.' 



Whilst the relation of the American Carboniferous rocks to those on the eastern side 

 of the Atlantic is still a matter of debate amongst our ablest geologists, I may well be 

 excused any attempt to correlate the few horizons marked by the occurrence of the 

 smaller fossil Rhizopoda with particular portions of the Carboniferous scries of this 

 country or of continental Europe. 



139. Southern Iowa no precise locality. Labelled " Residue from clayey 

 partings of layers of Fusulina-limestone. Upper Coal-measures." 



