52 
Tin American Geologist. 
July. 1893 
\ Leg-end . 
.Boundary oh ancient basm 
O Ga.s rceli borings. 
•X Termiva.1 mor&ine. 
The drift, as shown by gas-well sections, lias an average 
depth of one hundred and fifty feet; the deepest part of the 
basin is at the north edge of the city of Crawfordsville where 
a gas well was drilled; the mouth of the well is in an alluvial 
deposit about one hundred feet lower than the glacial deposit 
upon which the city is built ; the drill penetrated one hun- 
dred and fifty feet of drift, making the depth of the basin at 
