64 Hayes and Campbell—Appalachian Geomorphology. 
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| Deformed “Tertiary Peneplain ss. poss te bee ba eto Ue eae 83 
Wirrrain a AR DES es sickle s - cet boats ana hich ce eeete enc tine een eee tes a 
interior ‘Valley Gyre oir. .2 ela nck tieeve aac are alah ai cee 86 
Deformation of the Tertiary Peneplain........... By enon 88 
Interrelations of the two Peneplains .............-.00000e00e- 89 
Dissection ‘of the Tertiary Peneplain 2.) 3.3. ..0 ees) ee se eee 90 
Relative Dates of the orogenic Movements..............-....-. 92 
Movements inthe Tertiary Cycles: icy. chieeen nods eee 92 
Movements in the present Cycle ..............c ccc eeeneees 94 
Parn II DraineeeWevelopment,. <s\ssd5. sees ap pn eoiecie es ed oem 95 
SubdivisionsorthesProvincen.. secu aceae Gahene ecineld eee 95 
Qutline-of-therpresent Drainage oo). wie ea tak de cee eee 9 
Classification of Drainage.,.......,..5.:.+.. Wee outa as Saree 96 
Cycles\of draimage Developments. 2)... 2. cmst emesis oe eee 98 
Condittionsspreceding Cycle Wing s6 nw vates & Decision ee 100 
(E) Cretaceous’ Cycles i hive stars bec wie Werte eie lat el ctete te telenetel eS ye Reena 101 
Drainagevofl morthern: Vinee, ee toh cee ah mec Ls siete 102 
Drainage of the southern Appalachian Valley.............. 102 
Drainage of central Kentucky and Tennessee........... > lS 
Drainage of the Sequatchie Anticline.................+.... 104 
(2) ertitty Cycles ioe tc ss. Gist bindadeain Sane tortontecene ‘hone sera 105 
Hitects of Uiplitton: the: Axis OSPR ars ies ieee he ee eeenee 105 
Condition of Drainage prior to the Lafayette Depression. ... 107 
Diversion: of the -Ajpalachiana Riviera. woe. mise eee aie eee 109° 
Evidence from the Coosa-Tennessee Divide..... .......... 109 
Evidence from the Volume of Material eroded and deposited. 110 
Evidence from the Character of the Gorge below Chattanooga. 112 
Conditions immediately preceding the Diversion........... 114 
Manner in which the Diversion was accomplished.......... 115 
(3) -Bresembtn@yclere.e ii ec iliecelans Rest cual eee od aaeae al ete ae ere are 119 
Northward Diversion of the Tennessee ve: Solaire Sees 119 
Summary of the Drainage Development and Land Oscillations. . 120 
Parr. LDT—Sediumentany Records. sie. ssn tes. < oats an ose ne ea 123 
INTRODUCTION. 
REVIEW OF PREVIOUS WORK. 
The post-Paleozoic history of the Appalachian province has, 
until recent years, been known only in the most general terms. 
That the region has been a land area since the close of Carbon- 
iferous time was known, and it was assumed that, in common 
with other land areas, it had been repeatedly elevated and de- 
pressed, yet the extent and character of these movements, in the 
interior at least, were not only unknown, but no data were sup- 
posed to exist by which they could be measured. Along the 
