86 



IOWA STUDIES IN NATURAL HISTORY 



and Honey Creeks, on which are located the main roads of 

 the district, hundreds of prosperous farms, and the villages 

 of Limeridge, Sandusky, and Loreto. Wide areas of the 

 plain are found at or near Blake Prairie, Diamond Grove, 

 Rockville, Hurricane, Lancaster, (Fig. 19), Liberty Ridge, 











Fig. 19. A portion of the Lancaster topographic map showing the ex- 

 tent and distribution of the Lancaster plain in its type loca ity. 



Jamestown, and Cornelia in the Lancaster quadrangle, and 

 near Livingston, Rewey, Belmont, Cuba, and Fayette in the 

 Mineral Point quadrangle. In these two quadrangles the 

 surfaces representing the Lancaster plain are long and 

 broad, and are utilized extensively for various sorts of 

 human activity. Most of the surfaces are north-south 

 divides or east-west projections of north-south divides. 

 In the Elizabeth quadrangle in Illinois there are large 

 areas of this intermediate plain, the most conspicuous 

 of which are south of Apple River and northwest of Stock- 

 ton, (Figs. 20 and 21) , where there are surfaces 1x1 i/o miles 



