ShallowSlate/Benchslate

If this update calling Caves s Cliffs. Than why we have DeepSlate for deeps, but do not ShallowSlate for cliffs? This can be new decoration block that have all DeepSlate variations but with white-blue colour. So ShallowSlate will be generating above Y>159(in mountains) sometimes. So this is my suggestion. I hope we can reach some votes