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Niagara pinnacle reefs in northern Michigan are located in a band between a massive shelf-edge reef complex and deeper water facies in the Michigan basin. Pinnacles at the shelf ward edge of this band are dolomite, pinnacles at the basinward edge are predominantly limestone. Two distinct types of dolomite have been observed in the pinnacles.

The first type of dolomite occurs as clear rhombs about 30 to 100 microns in diameter. Its origin is attributed to mixing of meteoric and seawater at the base of a freshwater lens which was lowered down through the pinnacles during their emergence at...

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