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Gabbroic or noritic metanorthosite

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Dark mineral content in excess of 10 percent (part of unit Ya).
State New York
Name Gabbroic or noritic metanorthosite
Geologic age Middle Proterozoic
Lithologic constituents
Major
Metamorphic > Metaigneous > Metaintrusive > MetaanorthositeGabbroic or noritic metanorthosite
Comments Printed map does not contain a unit named 'ao'; only a unit named 'a' and mentions that 'overprint signifies dark mineral content in excess of 10 percent (mainly gabbroic or noritic metanorthosite)'. Overprint means that a different pattern is used over the color of unit 'a'. The digital version of the map has separated this unit out into a new unit and called it 'ao', so I have included it here.
References

Fisher, D.W., Isachsen, Y.W., and Rickard, L.V., 1970, Geologic Map of New York State, consisting of 5 sheets: Niagara, Finger Lakes, Hudson-Mohawk, Adirondack, and Lower Hudson, New York State Museum and Science Service, Map and Chart Series No. 15, scale 1:250,000.
NGMDB product
Counties Herkimer