Upper Falls of the Yellowstone River

Upper Falls of the Yellowstone River (HMUGA)

Location: Yellowstone National Park, WY 82190 Park County
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Country: United States of America
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N 44° 42.847', W 110° 29.88'

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Inscription
A waterfall is a clue that you are standing on a geologic crossroads.

A waterfall forms in a river channel where harder rocks meet softer rocks that erode more easily and quickly. Here, volcanic and hydrothermal activity have created the 109-foot (33 m) Upper falls.

Why here?

1 About 480,000 years ago, lava formed a layer of rock that resists erosion. The lava naturally cracks in a zig-zag pattern.

2 Over time, hydrothermal springs rose through some of these cracks, altering and weakening the lava.

3 The Yellowstone River flowed through the zig-zag cracks and eroded its river channel. Once the river reached the softer, hydrothermally-altered rock, erosion increased and created the Upper Falls.
Details
HM NumberHMUGA
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Marker ConditionNo reports yet
Date Added Tuesday, October 7th, 2014 at 4:17am PDT -07:00
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Locationbig map
UTM (WGS84 Datum)12T E 539761 N 4951315
Decimal Degrees44.71411667, -110.49800000
Degrees and Decimal MinutesN 44° 42.847', W 110° 29.88'
Degrees, Minutes and Seconds44° 42' 50.82" N, 110° 29' 52.80" W
Driving DirectionsGoogle Maps
Area Code(s)307
Closest Postal AddressAt or near 2000-2098 S Rim Dr, Yellowstone National Park WY 82190, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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