I believe this is in the wrong section, floof. This thread belongs mingling in with the 'Request/Find Meshes' section of the forum.
Old Meshes (http://some-art.deviantart.com/art/Old-Meshes-Package-Downloads-292854612?q=gallery%3Asome-art%2F32675198&qo=24)
There's a Volcano mesh in there that might help ye'. I wish you luck with your map.