Palisades

This specific area of Central Oregon and the High Desert is known for it’s unique landscape, particularly for the high, sheer canyon walls of columnar basalt with other layers of sediments and volcanic eras exposed. When basalt is beneath the surface it is called lava, when it is outside the earth’s crust, it is called basalt.  The Cove, the Deschutes River Canyon, the Crooked River Canyon, and atop the Peninsula from the Tam-a-lau trail are all excellent places to literally view evident layers of this history. 

Like layers of colored sand in a jar, the moment you enter the park you notice what seem like gentle heartbeats that paint the canyon walls, stripes and sections of different colors.  Geologists believe that these stripes and sections represent intervals of volcanic activity, lava flow, climate cooling and heating, all contributing to the forming and redirecting of rivers that meandered through the region in the last millions of years.

 

The geological history of the Cove is as complex and melodramatic as can be.  Because it is so complex, the earth has provided us with a drastic and diverse landscape, sputtered with colors of basalt, rhyolite, and sedimentary layers.  This landscape is also littered with sporadic buttes where the molting earth below was pressured to vent, along with fossils of animals and even sea creatures that roamed the land and sea, from when this great state was believe to be covered by the ocean.

Geologists believe that most of the rocks and outlay formation visible at the Cove was emplaced roughly 5-6 million years ago, after regional uplift and the basalt layers had settled from the Columbia River basalt formations.  It was during this time the new Cascades (Mt. Hood, Mt. Jefferson, The Three Sisters, etc.) were formed, giving enough height to alter the climate of this region, changing it from temperate to dry and arid as most clouds began to dissipate after their journey over the high peaks. 

The rocks we see now are mostly sands, gravels, conglomerates, and lava flow layers that left behind welded tuff and pumice, capped off by rim rock basalt flows.  Rimrock is the sheer rock wall at the upper edge of a plateau, canyon, or geological uplift.  When lava from nearby eruptions seeped through the area, it cooled quickly to form the “columnar basalt” that pedestals the peninsula.  These basalt columns are known as the famous “palisades” that the Cove Palisades State Park is named after.  We can also give credit to erosion and more (slowly but surely) regional uplift for the steepness of these canyons. 

The “Palisades” at the Cove are unlike any to be seen in Oregon.  They are towering and majestic, and as the sun comes up or begins to set, they absorb and reflect the deepest orange, brown, and purple hues.  They are so tall, that visitors often forget to LOOK UP! and to view these rocks that tower above them and admire the light reflecting off of the pillars.  It is humbling. 

About coveranger

"One's happiness depends less on what he knows than on what he feels." - Liberty Hyde Bailey

Posted on November 15, 2012, in Geology. Bookmark the permalink. 1 Comment.

  1. Beautiful! Thanks for sharing! I want to see this gorgeous landscape in person!

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