You are most likely in a Mega Taiga biome. It consists of a lot of mossy cobblestone boulders.
If you are underground, than you have found a dungeon and can now farm mobs for a lot of exp.
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Mossy cobblestone can be found in dungeons with monster spawners far below the ground level. They can only be found naturally and can not be crafted, and can also not be used to craft anything else. However, Notch, the developer of Minecraft, has said that mossy cobblestones will be used for crafting in future updates.
Grass and cobblestone.
Like a dispenser without a bow. cobblestone cobblestone cobblestone cobblestone [nothing] cobblestone cobblestone redstone cobblestone
You can not find cobblestone in Minecraft unless you find npc villages made of houses that contain cobblestone, or water turns lava into cobblestone.You can, however, obtain cobblestone by mining stone or already created cobblestone with a pickaxe.
It's called stone, and you get it by putting cobblestone on a furnace.