Iicrc uivcii of ,i;c(Pl(ii,'ic siniciuic ;is ;i pli.x sin^Tjipliic lci-iii is iiitcmli'il to Ipo 

 .•iliplicd t«i a plains riMiioii. ruder liic Icnii ucoid^'ic strucliirr me iiicliidcd 

 till' iy\H's of rcyionai rocU and llic lil lnilniric succcssioii. as well as the in- 

 cliiiatidii (d" the strain, llssciil ially this is llic (lcsci-i|it i\c si ral i,m-apli.v and 

 till' rcnional di]! of llic rock. It is lillioio,t;y and slrnclnrc. A pli.\ sio^'rapliic 

 paper need ha\-e no more of tliis i>hasc of t;('oloi,'y i,'ivcn liian is necessary 

 to show tlio n>sponsiitility of tlio inclination of the strata, the tyitc of rock, 

 and the relationship of the rock iaycM-s as conditionin;: factors in the devel- 



OUTLINE /HAP OF SOUTHERN INDIANA 

 SHOWING LOCATION OF AREA 

 TREATED AS AN EXAMPLE OF 

 EXPLANATORY PHY5I0CRAPHY 



opnient of tojioiiraphic forms. It is the intenti(»n of the writer in this 

 paper, however, to show specifically that the topographic forms present in 

 the stages of youth and maturity are dependent very hirgely upon litholojry 

 and structure. 



Toi)oj;raphic condition is the state of a retjion with i-csi)ect to the form, 

 size, and relationship of the relief features. The slnii>lest topographic con- 

 dition is that of a level plain. The coastal plain is an example. The topo- 

 graphic condition becomes more complex as relief or difference in elevation 

 from iilace to i>lace i.s jiroduced hy the physiograiihic ))roce.*;ses. chief of 

 which is ruiuiing water. Essentially. toi>ograi)hic condition is expressed 

 generally hy stating tiie stage of toiiographic develojiment in terms of tlie 



