421 



sheet to the Flatwoods region and immediate vicinity, and show how it 

 was responsible for the peculiar phenomena of the area. For an intimate 

 knowledge of glaciology and its broad relationships, the reader's attention 

 must be given to the many text-books and matter dealing specifically with 

 such phases. That glaciation has taken place over very large areas of the 

 world is no longer a theory. The most obtuse have long been convinced 

 of that fact. The most important phase concerning glaciation before the 

 scientific world today, is the manner in which it took place in specific- 

 areas. The most interesting features of this phase of glaciation occur in 

 the phenomena existing along the border, or near the border, of the one- 

 time ice-sheet edge. The Flatwoods region belongs to this phase. 



Leverett has given a detailed account of the drift border in southwest- 

 ern Indiana. The drift border through Greene, Owen and Monroe counties, 

 he credits to O. E. Siebenthal. "From near Scotland (southern Greene 

 County) it has a course slightly east of north to the valley of Plummers 

 Creek, in section 9, T. N., R. 4 W. North of this creek it makes an east- 

 ward protrusion of about two miles into a lowland tract known as the 

 American Bottom, reaching section 36, T. 7 N-, R. 4 W. North of this low- 

 land the course of the boundary is west of north to the valley of Richland 

 Creek, in section 9, T. 7 N., R. 4. W. It follows the east bluff for about 

 three miles and crosses to the west side of the creek in section 35, T. 8 N., 

 R. 4 W. It follows nearly the west bluff to section 17, T. 8 N., R. 3 W., pass- 

 ing about a mile southeast of the village of Newark. The boundary makes 

 an eastward protrusion of about a mile into Richland Creek valley in 

 section 16, from which the course is northward into Owen County. Enter- 

 ing Owen County in section 33, T. 9 N., R. 3 W., the boundary leads north- 

 eastward past Freeman post office and crosses into Monroe County in 

 section 6, T. 9 N., R. 2 W. The coarse continues northeastward through 

 northern Monroe County, the boundary being about two miles north of 

 Ellettsville and one mile north of Modesto, and coinciding nearly with 

 Indian Creek valley from mouth to source." (Monogr. XXXVIII, U. S. 

 Geol. Surv., pp. 34-38.) 



The above detailed line of the glacial limit places the whole of the 

 Flatwoods region well within the limits of the drift line. While it is not 

 the intention of the writer to disprove the general limit of the drift as 

 interpreted by Leverett, there must be some variation made in the Flat- 

 woods region. Perhaps it should be m;ule clear that in the detailed work 

 done by the writer, searching attention was given to the probable advance 



