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Name: Jim
Status: Other
Grade: Other
Location: NY
Country: United States
Date: Summer 2010


Question:
I have a large rock (80+ lbs.) made up of various fossils that I keep on my back deck. The recent heat wave in Western New York has caused the side of the rock to crack and a medium brown substance to ooze out from the rock. The substance is thick and smells like petroleum jelly. What is the substance? (pictures can be provided)



Replies:
The substance is most likely tar. Tar can sometimes be found within limestone having seeped into the rock while in the ground.

Steven A. Miller



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