Friends of Malheur National Wildlife Refuge

Friends of Mlaheur NWR
Friends of Malheur National Wildlife Refuge

Friends of Malheur National Wildlife Refuge promotes conservation and appreciation of natural and cultural resources at Malheur Refuge through education, outreach, advocacy and on-the-ground stewardship. Support this podcast: https://podcasters.spotify.com/pod/show/malheurfriends/support

  1. 16/05/2019

    Stop #4: Basin-and-Range Geology

    At this point, you are within the geological province known as the Brothers Fault Zone, a narrow and highly fractured area between the still-spreading Basin-and-Range province to the south and the older, more stable mountains to the north. Look around at the isolated buttes and flat-topped ridges. These fragments of the originally contiguous land- scape have been separated by faulting and subse- quent erosion. Before you finish this tour, you will pass from the Brothers Fault Zone into true Basin- and-Range topography.  Look to the south, up the Blitzen Valley. To the left is Steens Mountain—a single 35-mile-long fault block and the headwaters of the Blitzen River. As tectonic movement stretched the land between the Rocky Mountains and the Sierra Nevada and Cascades in an east–west direction, long north–south faults appeared. These breaks in the Earth’s crust separated great blocks of land, tilting them as steep as sixty degrees.  Steens Mountain, with a summit approaching 10,000 feet, is a classic fault-block mountain, gently sloping on its west side, but dropping vertically a mile to the Alvord Desert on its east side. Snow melt from the broad western face is carried downhill by five major streams, which eventually merge to become the Blitzen River. Over the eons, the river has deposited many feet of sediment on the valley floor. These fertile soils, combined with the waters of the Blitzen River, provide an optimal foundation for the marshes and wet meadows of the Refuge.  --- Support this podcast: https://podcasters.spotify.com/pod/show/malheurfriends/support

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Friends of Malheur National Wildlife Refuge promotes conservation and appreciation of natural and cultural resources at Malheur Refuge through education, outreach, advocacy and on-the-ground stewardship. Support this podcast: https://podcasters.spotify.com/pod/show/malheurfriends/support

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