170 University Geological Survey of Kansas. 
Along the east side of the west half of the southwest 
quarter of section 22, township 27 south, range 18 east, in the 
river valley just east of Chanute, Mr. Knapp drilled five wells 
on a north-south line. The records of these wells were care- 
fully kept, as were the records of two wells one on either side 
of this line. The lower portions of the logs of these wells, 
showing the sandstones encountered, are presented, drawn to 
a seale, in figure 4. The relative distance between the wells 
is indicated on the diagram and in the arrangement of the 
well sections. The surface is almost level, as the wells are in 
Neosho valley, where the slope is not more than 2 or 3 feet to 
the mile. A glance at figure 4 will shown the irregularity in 
the horizons at which the sands were encountered. In some 
cases the records of adjacent wells correspond closely in re- 
gard to particular sands, but it will be noted that some of the 
sands which are well marked in certain wells are wholly ab- 
sent in others. 
It is useless to pad this report with further detailed illus- 
trations. Those just given from the vicinity of Humboldt and 
Chanute are exact reports from actual’ measurements. No 
pool of any considerable importance has been discovered any- 
where in the entire Midcontinental field which does not yield 
similar illustrations of the irregularity of both vertical and 
horizontal extent of the sandstone beds. Probably one of the 
longest stretches of unbroken sandstone lies principally in 
Oklahoma in the vicinity of Bartlesville, with the north ex- 
tremity reaching into Kansas. Here, so far as now known, a 
stretch of many miles has been found without any important 
break in the sandstone. And yet an occasional dry well or 
dry area is found, which probably is due to similar changes 
of the sandrock. 
In order to understand these apparent variations of sand- 
rock conditions, it might be helpful to study modern ocean 
beaches. As is well known, along our ocean beaches in places 
we find an unbroken beach of pure sand many miles in extent. 
In other places the beach is cut up in a great variety of ways by 
streams crossing it to enter the ocean, by mud-banks, by 
eravel-bars and other familiar variations. Should we make 
a vertical section of such a beach parallel with the coast under 
the first-named conditions, it would appear almost uniform for 
a long distance, while under the second set of conditions it 
would be very much more irregular. If, now, a transverse 
