The Region About Atlanta, Georgia. — Purington. 107 
longitudinal trend of the Appalachian folds, 'in a southwest 
direction ; while a number of smaller streams, farther cast, 
flow southeast, in accordance with the slope of the peneplain. 
Hayes and Campbell, in a recent paper,* have traced out the 
development of the separate Cretaceous and Tertiary pene- 
plains in the southern Appalachians, and have stated that the 
region of central Georgia is that of least differentiation be- 
tween the two. According to this, the denudation of the pene- 
plain is the joint product of Cretaceous and Tertiary time, 
and its dissection must be chiefly referred to late or post- 
Tertiary agencies. 
The maps, however, show that certain parts of the area 
have not submitted to the general base-levelling process. 
The most noticeable examples of these extra-resistant masse- 
are Kenesaw and Lost mountains and Stone mountain. The 
two first are near Marietta, and the latter is about sixteen 
miles east of Atlanta. The two first mentioned have their 
longer axes in the direction of the prevailing folds. Kenesaw 
mountain is a great monocline, its beds of gneiss having a 
general dip to the southeast of -40°. Lost mountain I have 
not examined, but its structure is probably not different. 
In looking at Stone mountain on the map, one is surprised, 
at the first glance, to see that its longer axis lies in a direc- 
tion at right angles to the strike of the crystalline schists. 
In a geomorphological sense, all these elevations. Lost, Kene- 
saw, and Stone mountains, can be classed under the head of 
monadnocks.f but while Kenesaw is only a massing of ex- 
tremely resistant beds of the country rock. Stone mountain 
must be different. 
The first view of Stone mountain from the train fixes it as 
an object worthy of notice. On a near approach, its shape, 
that of an immense dome, its abrupt and towering hight, its 
steep sides of solid rock, bare of all soil and vegetation, and 
streaked by the rain with long white lines, make it a truly 
remarkable sight. The ma<s rises directly from the surround- 
ing gneiss, and no talus encumbers the base. It i- composed 
*Geomorphology of the Southern Appalachians, bj C. W. Hayes and 
Marins R. Campbell. Nat. Geographic Magazine, Maj 23. 1894. 
|A term suggested by Prof. \Y. M. Davis, in allusion to Monad :k 
mountain in New Hampshire, and used bj Messrs. Hayes and Campbell 
in i he p;i per referred to above. 
