PAPERS ON GEOLOGY AND GEOGRAPHY 211 



THE STRATIGRAPHY OF THE KINDERHOOK 



GROUP IN WESTERN ILLINOIS AND 



MISSOURI 



ABSTRACT 



R. C. Moore, University of Illinois 



Strata of the Kinderhook group, comprising the lowermost 

 division of the Mississippian system in the central Mississippi 

 Valley states, outcrop in southeastern Iowa, western Illinois 

 and around the Ozark highlands of Missouri into northern 

 Arkansas. The character of the rocks in different parts of 

 this area and the fossil faunas which they contain afford the 

 data for a study of the very interesting but complex physical 

 history of the region at this time. 



Recent examination of the Kinderhook beds across the state 

 of Missouri, with careful study of their faunas, throw light on 

 important stratigraphic problems and necessitate some changes 

 in previous conceptions of the Kinderhook. 



The Kinderhook rests with distinct unconformity on older 

 formations, which vary in age from early Upper Devonian to 

 the Lower Ordovician. It is similarly delimited at the top in 

 many places, succeeding beds containing a distinct new fauna 

 which may be traced throughout the Mississippian area. 

 Within the Kinderhook a number of changes in the relation 

 of sea and land took place. 



EROSION FEATURES OF THE MESA VERDE 



W. H. Haas, Northwestern University 



The Mesa Verde is a part of the extensive plateau region 

 of the southwest, and, in general, possesses the usual plateau 

 characteristics. Its history is so closely connected with that 

 of the larger physiographic unit that the area scarcely can be 

 considered, adequately, except in its larger relationship. This 

 larger "Plateau Province," as the area was named by Powell 1 , 

 is roughly circular with its center a little west of the juncture of 

 the four states, Arizona, Utah, New Mexico, and Colorado. 



button, C. E. : Second Ann. Rep't. p. 50, 1880-81. 



