The rock that can hold Midtown skyscrapers is hard, intact micaschist, he said.
2.
The granite itself carries only minor U-Bi veins; most mineralisation is contained in veins in micaschist.
3.
The oldest unit of the basement rocks are Neoproterozoic micaschists of the Parautochthonous Micaschist Unit ( " PMU " ).
4.
This uplift has pushed up the Parautochthonous Micaschist Unit-structurally the lowermost nappe unit below the Lower Gneiss Unit-on its eastern side.
5.
The southern branch overlies the leptynitic augengneisses, which in turn are thrust over the mica schists of the Parautochthonous Micaschist Unit ( PMU ) or the Saint-Mathieu Leucogranite.
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