10 PROCEKDINGS OF THE PITTSBCRrx ^rEET^N(^ 



The last paper was presented in abstract b}^ W. M. Davis. 



DEVELOPMENT OF THE SOUTHEASTERN MISSOURI LOWLANDS 

 BV C. V. MARBUT 



[AhstracQ 



The lowland region of southeastern Missouri consists of two broad belts of fiat 

 lowland with a discontinuous ridge between them. One of the lowland belts is an 

 abandoned valle}' of the Mississippi river, the other is the vallej^ of the Ohio. The 

 Mississippi river has gained its existing valley by two successive changes, abandon- 

 ing lirst about 200 miles of its original valley, and later about 20 more. It was led 

 to abandon its valley because of a shorter and steeper course having been offered 

 it by the Ohio. The Ohio drainage first captured some small tributaries of the 

 ]\fississippi, and later the Mississippi turned itself into these valleys in succession 

 by sapping the ridge between. Since the capture of the Mississippi several of the 

 smaller rivers of the region have abandoned their older valleys. 



The paper is printed in " Universit}^ of Missouri Studies." 



The Secretary spoke of the successful efforts of Dr J. M. Clarke for a 

 memorial tablet on the Emmons house in Albany, New York, and sul)- 

 mitted the following matter for record : 



MEMORIAL TABLET ON THE EMMONS HOUSE, ALBANY, NEW YORK 



With the approbation of the Geological Society of America, and with 

 Section E, American Association for the Advancement of Science, as in- 

 termediary, a memorial was brought before that Association at its New 

 York meeting, 1899, by Dr John M. Clarke, urging the Association to 

 approve the erection of a tablet (see plate 1) on the house in Albany 

 which was formerly the home of Dr Ebenezer Emmons, State Geologist 

 of New York in charge of the Second Geological District, 1836-1842, to 

 commemorate the fact that the Association looks on this house (see 

 plate 2) as the place of its birth. 



At its Denver meeting, August, 1901, the Association received and 

 adopted the report from its committee recommending the proposition, 

 and as this report is an interesting record of an important event in the 

 history of American geology, it is given herewith : 



Report of Committee of American Association for the Advancement of 

 .SciEN'CK on the Emmons House Memorial 



The American Association for the Advancement of Science was organized in 

 1847. It was the organic descendant and enlarged outgrowth from the Association 

 of American Geologists and Naturalists. The latter body was created in 1842 by 

 the incorporation of the Naturalists within tlie Association of American Geologists. 



