148 
Frank Carney 
sive sandstone, locally conglomeratic; the Sharon is less massive, \ 
and locally coarser; this characterization of these two formations 1 1 
applies specifically to the area studied. While neither of these ! : 
sandstone formations overlies impervious beds, yet in themselves { « 
they are variable in texture and structure, and the region is so ma- ■ 
turely dissected (fig. 15), that conditions are very favorable to the ; I 
development of springs. Furthermore, the Logan also contains li 
beds that are water bearing. | 
(2) The early settler in agricultural lands found a spring, if j| 
possible, and then built his log house. Others coming into the [ I 
Fig. 10. The iron content of this Sharon rock induces the “honeycomb” effects ! 
in weathering, and also makes the springs less desirable. | 
region made similar locations. Settlement generally moved along 
streams, since in the absence of roads valleys are more accessible. 1 
If the valley has been developed in water-bearing formations, ' 
which are not much tilted, springs border the bottom land on j 
either side. Both topographic convenience and the presence of 
water tended to confine the earliest habitations to the valleys. ■ 
Later settlers spread over the intervalley areas, building their 
houses in proximity to springs. 
Primarily the highways lead from house to house; eventually, j 
however, several factors become operative before the roads are 
permanently fixed. In the case of a valley having a commodious 1 
