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Photographed 4 September 2018.
Mount Moran reflects all the geologic forces shaping
the Teton Range. Formed of a massive block of
metamorphic gneiss; cut by dikes of igneous
granite and diabase; capped by sedimentary
sandstone; and flanked by glaciers, this formidible
peak dominates the park's northern skyline.
The gneiss and granite are among the oldest rocks
in North America, 2.7 and 2.5 billion years old
respectively. These resistant rocks form the core
of the Teton Range. The vertical
“Black Dike” of 775 million year old
diabse is about 150 feet wide
and jut from the mountain's face because the
surrounding gneiss has eroded away.
Five glaciers — Falling Ice, Skillet and
Triple — flank Mount MOran. These glaciers
formed during a cool period called the
Little Ica Age that ended around 1850 AD.
Over the past 40 years, the park's glaciers
have shrunk by more than 20 percent due
to our changing climate.
Tan sandstone caps the summit of
this massive peak the remnant of a
510 million year-old beach that
stretched for hundreds of miles north
and south of here. Sandstone overlies
the Black Dike and other ancient
igneous and metamorphic rocks.
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Date and time this page was prepared:
3/23/2020 1:09:47 PM