I06 RE VIE IV S 



ciently complete to be satisfactory or conclusive. On account of the 

 continuity in sedimentation, with little epeirogenic movement and but 

 slight lithological differences as compared with the preceding forma- 

 tions, and on account of the presence of a transitional flora including 

 many persistent Upper Coal-measures species, a much more thorough 

 investigation of the plant fossils of the Dunkard and Monongahela 

 measures will be necessary before the boundary or approximate limit 

 between the Coal-measures and the Permian can be drawn. 



Walchia and Ullmannia, though present in other Permian basins 

 of this continent, have not yet been found in the Appalachian trough. 

 The upper part of the Dunkard is referable to the Rothliegende, 

 probably to the Lower Rothliegende. Beds of the Zechstein or Upper 

 Permian do not appear to have survived in the Appalachian basins. 



Glacial Bowlders Along the Osage River. By E. R. Buckley, 

 S. H. Ball, and A. T. Smith. 



The discovery of glacial bowlders along the Osage river, fully 

 thirty miles south of the known southern limit of the ice sheet, was 

 simply an "episode" in the systematic strategraphic work which the 

 Missouri Bureau of Geology and Mines is at present conducting in the 

 Ozark region. The fact, however, that in no less than eight localities 

 along the Osage river in Miller county granitic bowlders of undoubted 

 foreign origin were observed is in itself a contribution to the glaciology 

 of this region. This discovery also has a bearing on the physiographic 

 history of the region, giving evidence of the age of the Osage river 

 channel. 



In brief it may be said that, if one were to include foreign erratics 

 of all sizes observed at the eight localities, he might perhaps account 

 for several hundred bowlders. These bowlders consist of several 

 varieties of granite, granite-gneiss, and diorite. They range in size 

 from pebbles having a diameter of several inches to bowlders three 

 feet in diameter. 



They occur along the present river channel and also back from it, 

 along the tributary streams. In no case, however, were they found at 

 a greater elevation than 605 feet A. T., which in that region is about 70 

 feet above the low-water level of the Osage river. Nowhere on the 

 ridge land between the Osage and Missouri rivers is there any evi- 

 dence of glaciation. 



The evidence at hand warrants us in believing that the glaciers did 



