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While maps provide a location in space, geologists must
also locate their study sites and specimens with respect to relative geologic time.
This is commonly done by identifying the geologic formation that is represented
at a particular site, based on previous work in the region.
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In the case of Lime Kiln
Park, outcrops at the study quarry are part of the Racine Formation. Work by
several generations of geologists in southeastern Wisconsin has demonstrated
that the Racine Formation overlies (is younger than) the Waukesha Formation and
underlies (is older than) the Waubakee Formation. Previous work has also shown
that the fossil content of the Racine Formation indicates a Silurian age.
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