gouged-out wall

I have no idea what my wall is made of, but I can't get into it with a standard drill and bit or with a "self-drilling anchor". All I managed to do is gouge out a hole in the wall. Any idea what it may be made of, or how to get into it?
Another wall has a similar problem: I can't hammer a nail into it deeper than a coupla mm. Presumably made of the same stuff, but this time I didn't try much harder than that to get into the wall.
Thanks,
Michael Hamm not much of a DIYer (obviously) snipped-for-privacy@math.wustl.edu http://www.math.wustl.edu/~msh210 /
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How old is the house, and where is it located?
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JoeSpareBedroom wrote:

And what does the texture seem like where you tried drilling?
My guess is it's lathe and plaster, but other possibilities exist...
--
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Nobody can hammer a nail into a lathe. After all, most of them are made of cast iron. OTOH, he may have plaster over lath, which could be rock lath, metal lath or wood lath strips.
Joe
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This is from an old thread. I'm using Google Groups (alas) which was acting up, so I couldn't see (at that time) that my post even went through to Usenet. I assumed it didn't until I just came across it now and read the responses. Here's my followup.
Me, back in September:

JoeSpareBedroom:
1948 (I think), and St. Louis County, Mo.
dpb:

Sandy. More precisely, like a rock that's been pulverized. Perhaps like concrete or cement that's been pulverized, but I don't know enough about them.
People have answered what they think it may be -- and thanks -- but any idea how I can get into it?
Michael Hamm
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Post a picture someplace. Could be plaster, could be brick or block behind it. Could be a lot of things. When was the house built?
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Concrete ?
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