About a week ago when it was raining hard outside I went down in my basement and saw what I thought was a puddle of water at the bottom left of my stairs. I put the dehumidifier back on to try to dry some of it up. After a few days I went back downstairs to find that it was mostly still there and kind of dark in color. So I bent down and stuck my finger in it and it was oil. I do not have oil heat, I have gas heat. I am told that my house was built in 1868. I have no clue as to why there would be oil on the basement floor. I don't know if this might have anything to do with it at all, but they are drilling for oil on the property across the road from me and have been for a few months now. Could this be connected? Does anyone out there have any idea what is going on in my basement?