x0=8.555000 y0=5.896667 label="Chalk" xt=.000000 yt=.000000
x0=8.843333 y0=4.818333 label="Liassic" xt=.000000 yt=.000000
x0=9.343333 y0=3.218333 label="Triassic" xt=.000000 yt=.000000
x0=6.743333 y0=5.433333 label="Salt" xt=.000000 yt=.000000
x0=8.671667 y0=7.378334 label="Tertiary" xt=.000000 yt=.000000
x0=7.766667 y0=8.726666 label="Sand" xt=.000000 yt=.000000