An associational study of Illinois sand prairie . Figure 4. View from top ofWatch Tower Hill, showingthe height above the surrounding country, and theDevils ^ 1 The island between Crane Creek on one side, and Quiver Creek andthe Black-jack Ditch on the other, is not so clearly defined as theone on the other side of Quiver Creek, nor has its northern end beenstudied. I have been through most of its southern half, and theboundaries given on the map for it are fairly accurate. The otherlarge island, lying between Black-jack Ditch and the river, is verysandy, especially near Saidora. The ot


An associational study of Illinois sand prairie . Figure 4. View from top ofWatch Tower Hill, showingthe height above the surrounding country, and theDevils ^ 1 The island between Crane Creek on one side, and Quiver Creek andthe Black-jack Ditch on the other, is not so clearly defined as theone on the other side of Quiver Creek, nor has its northern end beenstudied. I have been through most of its southern half, and theboundaries given on the map for it are fairly accurate. The otherlarge island, lying between Black-jack Ditch and the river, is verysandy, especially near Saidora. The other parts of the same regionhave not been studied. The Physical History of the Sand DepositsThe physiography of the sand region is discussed in the Soil Survey for Tazewell County (Bonsteel, 1903), with a description of thesoil types, and a jnap showing their distribution. Chainberlin andSalisbury (1885: 261, 262) describe the method of deposition of gla-cial outwash, especially in the Mississippi river valley. Importantinformation is also found in the Illinois Glacial Lobe (Leverett,1899) and in the reports of Hart and Gleason (1907), and of Gleason(1910).


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