~ WHITE «WESTWOOD . HALEDON, | . A SCARSOA LE * eCLOSTER : § PLAINS DEMARE ST CLIFTON, ¢ . \ CELLEVILLE, * = LF) eo s . ty O Upper Boy tower Gey + af Atlantic o1i234 MILES FREQUENCY Fig. 3— Location of Lamont Geological Observatory soil sampling sites, 1955. 40 80 120 160 200 240 DIS/MIN OF EXCHANGEABLE $r9%/SQ FT 280 Fig. 4—Histogram of Sr* per square foot for New York soils. 9 320 360