GRD02MTS0
W81-64
Oolitic Ironstone
Precambrian › Proterozoic › Paleoproterozoic › Orosirian
1800.0
-
2050.0
1
Ritter 154 › Cabinet 17 › Drawer O
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Oolitic ironstone interlayered with quartz and iron. Original label: Same locality. Oolitic rock. This formation is lateral equivalent of Greenflint Chert. Samples from Tom Johnson.
Samples W81-62 through W81-64, see Winterer 1980-1981 notebook page 163.
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Minnesota
Mesabi Range. NE corner of Mary Ellen Mine near Biwabik.
Latitude: 47.5427°
Longitude: -92.346268°
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Iron ooids in quartz
2.5
plane
Iron ooids in quartz
2.5
crossed
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scan
crossed
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scan
plane
GRD02MTT0: Iron ooids with quartz cores. Quartz layers. Finely laminated in places. (C. Eichler)
N/A
N/A