Earth Monument to Chicago
1971

Natural earth drillings consisting of :1) Sand, gravel and clay mixture; 2) Very stiff gray clay silt; 3) Fine sand with gray clay; 4) Gravel with gray clay 5) Dense gray clay silt; 6) Hard pan; 7) Green shale; 8) Sandstone; 9) Dolomite with pyrite (a form of limestone)

5.7 x 182.9 x 243.8 cm (2 1/4 x 72 x 96 in.)
Museum of Contemporary Art Chicago

Rock Monument
1971
Stones
48 x 36 in.

Geologic history of South Florida from 0 to 100 ft