184 
Ohio Biological Survey 
tcgia virginiaiia, Sparganiiim curycarpiim, Typha latifolia and many 
sedges, are abundant (^ig. 4g). 
This area is swampy, not because there are no streams to carry off 
the surface waters, as on uplands, but because the water table is always 
near the surface in this low-lying area of slight relief. Instead of the 
gradual sinking, and spreading of ground water, as under the flat uplands, 
there is a constant flow from the hills bordering the lowland area under 
the swamp lands to the shallow drainage lines. 
Fig. 42. The swamp at Glenwood extends to the foot of the distant hills; Hibiscus 
in bloom; shrubs are Salix nigra. 
In all probability, upper iMill creek valley, and the Little Miami- 
Miami pre-glacial valley supported similar types of vegetation. Leverett 
(1902) speaks of a “marshy tract” in Mill creek valley above Sharonville, 
which was still undrained and not fit for cultivation in 1889. Water in 
wells in IMill creek valley stands practically at the surface (Leverett, 
1902), and the same condition is found near Glenwood. 
Glacial hills. —The low glacial hills along the western side of the 
valley are a continuation of the morainal hills of the upland. In origin 
