Presque Isle, Marquette Co., Michigan, USA

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Agate-Ensconced Pickled Peridotite Nuggets
	Presque Isle, Marquette Co., Michigan, USA Approaching the peridotite flow, the Jacobsville Sandstone becomes cracked and riddled with veins of quartz and agate, suggestive of heaving ground and hydrothermals and volcanism. The black blobs appear to be perdotite chunks.
© 2004	Photo ID: 127275 View Count: 143
Periodite Flows
	Presque Isle, Marquette Co., Michigan, USA The core of the Presque Isle peninsula is formed by a dark peridotite flow partly enveloped by the red Jacobsville Sandstone. Photographed May, 2004 by Dave Maietta.
© 2004 Dave Maietta	Photo ID: 127274 View Count: 108

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Presque Isle, Marquette Co., Michigan, USA

Agate-Ensconced Pickled Peridotite Nuggets

Periodite Flows