Split Rock
Conflation of Blathers
1. No or very little sedimentary rock. No metamorphic rock.
That only leaves igneous rock. However, igneous rock forms from volcanic activity, and there wasn't any, so where does that leave you? Its the same problem as having sedimentary or metamorphic rock. I would suggest, it would either be a type of rock that cannot be formed by natural processes, or a uniform layer of somekind of rock... the type really doesn't matter. On top of that would need to be a good layer of soil.
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