I started to remove the carpet from the stairs that lead to my basement. Under the carpet is a foam padding, but under that is a dark, hard, speckled material. I'm scared to remove it as I have no idea what the material is. It doesn't seem to be glued to the stairs from what I can tell.
Does anyone know what it is, why it's there and if it's safe for me to remove it?
My house was built in 1950, but I have no idea when the carpet was installed.
Image can be seen here: flickr.com/photos/[email protected]/6969296269/in/photostream