The glacier biome would generate in the very heart of cold biome areas and would generate quite differently from other biomes. Instead of having grass or sand in the first layer, it would have snow blocks. Under the snow would be a few layers of ice and then packed ice. After that is stone and continues as normal. Another thing is that the ice continues for quite a few blocks more than dirt would in other biomes.
Caves in this biome would begin with ice walls and turn to stone when you get deep enough. In this layer blue ice can generate like any other ore, making this one of the (or even just the) only place on land where you can naturally get blue ice.
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