36] 
SOME SPECIAL PHYSIOGRAPHIC FEATURES OF THE KNOB- 
STONE CUESTA REGION OF SOUTHERN INDIANA: AN 
EXAMPLE OF EXPLANATORY PHYSIOGRAPHY. 
By 
CuypEeE A. Matuorr 
INTRODUCTION AND STATEMENT OF PROBLEM.......... 361 
DEFINITION OF GEOLOGIC STRUCTURE AND TOPOGRAPHIC 
SG LO ING eens an ea eg etsy. i kets a Oe ak A to Viet os 362 
GEOLOGIC STRUCTURE OF THE KNOBSTONE CUESTA 
iil DIGIC DS Sat URS Pe tere cies ante cards Ca aS Seen See Se aN 364 
CEA S lites CTA. 2; emcee tala iale eae Mets aucials 6 eRe Nes ban onion a 364 
PES ATA Pia ond Ne 2 ee oF aes ees Cetreuren tes chores 1 es Pa lh 365 
Pe Area sO iterop.orliathologi en Wanitsy 0 9 easens 2s, terete daest eee chore et 365 
TOPOGRAPHIC CONDITION OF THE KNOBSTONE CUESTA 
TE BLE GN OTN SUE CRE IT EAE oles ce, cM ng eT Sere 366 
Factors Involved in Development of Topograhie Condition....... 366 
riniiTencerotelaithrol ose peers, (hance, orkss: adhe Sea e TRE oh hg ee 367 
Influence of Physiographic Development.....................4. 369 
Ra eehCULIAR, GRADIENT OF BLUE RIVER, .. ......22..).% 372 
Pee LB CASH OR STRAAM: PIRACY. «os... 406 foe. ck oR 373 
The Development of Muddy Fork of Silver Creek by Piracy...... 373 
The Potential Future of Muddy Fork of Silver Creeke........... 379 
Development of Special Bed-rock Terraces..................-... 380 
SMEs, AND (CONCLUSION. i. unl Cees. betas Fee aie CaM 382 
SOME SPECIAL PHYSIOGRAPHIC FEATURES OF THE KNOBSTONE 
CUESTA REGION OF SOUTHERN INDIANA: AN EXAMPLE 
OF EXPLANATORY PHYSIOGRAPHY. 
BY 
OLYDE A. MALOor, 
(Indiana University. ) 
INTRODUCTION AND STATEMENT OF PROBLEM. 
Physiography is a study which deals largely with the development of land 
forms. It attempts to explain the landscape by the action of certain pro- 
cesses on earth materials under particular conditions, and is perhaps less 
descriptive than it is explanatory. Probably no other phase of physiography 
presents so many problems as the results of the action of running water on 
the many kinds of rock material under various geologic and topographic 
conditions. The intricacies of drainage development and adjustment, traced 
by means of topographic forms, often present a history by no means simple. 
