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Page 1: Geologic Map of Isle Royale National Park - geo.mtu.edu Map of Isle Royale National Park ... unknown offset/displacement, know or certain u nk ow f s et/d ipl ac m, r x unknown offset/displacement,

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May 2008

National Park ServiceU.S. Department of the Interior

Geologic Map of Isle Royale National Park

Isle Royale National ParkMichigan

Produced by Geologic Resources Division

¬ 0 5 102.5 Miles

Geologic Attitude and Observation Localities

o

strike and dip of beds

¹

strike and dip of lava flows

: downthrown side of fault

Mine Feature Localiteis

Ì prospect pit

» mine shaft

# diamond drill hole

Paleoshorelines

beach crest, known or certain

wave-cut cliff, known or certain

wave-cut cliff, approximate

Glacial Line Features

direction of glacial movement, known or certain

drumlin, known or certain

kettle, known or certain

Faults

unknown offset/displacement, know or certain

unknown offset/displacemen, approximate

unknown offset/displacement, concealed

Linear Geologic Units

base of pegmatitic zone in Greenstone Flow (pg)

0 7.5 153.75Kilometers

Geologic Contactsknown or certainapproximateconcealed

% % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % % gradationalshorelineshoreline, approximate

Geologic UnitsQal - alluviumQts - talus, slopewash, and glacial driftQg - glacial tillcu - Copper Harbor Conglomerate, undividedcc - Copper Harbor Conglomerate, chiefly conglomeratecb - Copper Harbor Conglomerate, boulder and cobble conglomeratecp - Copper Harbor Conglomerate, pebble conglomeratecs - Copper Harbor Conglomerate, chiefly sandstonepu - Portage Lake Volcanics, lava flows, undividedpsc - Portage Lake Volcanics, sandstone and conglomeratepp - Portage Lake Volcanics, pyroclastic rockspsp - Portage Lake Volcanics, Scoville Point Flowpei - Portage Lake Volcanics, Edwards Island Flowpmp - Portage Lake Volcanics, Middle Point Flowpli - Portage Lake Volcanics, Long Island Flowpth - Portage Lake Volcanics, Tobin Harbor Flowpwi - Portage Lake Volcanics, Washington Island Flowpg - Portage Lake Volcanics, Greenstone Flowpgi - Portage Lake Volcanics, Grace Island Flowpm - Portage Lake Volcanics, Minong Flowph - Portage Lake Volcanics, Huginnin Flowphp - Portage Lake Volcanics, Hill Point Flowpai - Portage Lake Volcanics, Amygdaloid Island Flowwater

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