IMG_5662

Red Rock Country Road Trip Part 2

Beautiful blue skies and desert sun for a couple more days of hiking in Arches National Park and Canyonlands National Park, enjoying the spectacular views.

 

IMG_5410 IMG_5412 IMG_5419

 

It’s fascinating to consider the creation of Arches NP. It lies atop an underground salt bed which is responsible for the formation of the arches, spires, balanced rocks, sandstone fins, and eroded monoliths. Over millions of years, the salt bed was covered with debris. During the Early Jurassic Period desert conditions prevailed and the vast Navajo Sandstone was deposited (c200m years ago).

 

IMG_5430 IMG_5458 IMG_5463

 

An additional sequence of stream laid and windblown sediments, the Entrada Sandstone, was deposited on top of the Navajo (c140m years ago). Over 5,000 feet (1,500 m) of younger sediments were deposited and have been mostly eroded away.

 

IMG_5470 IMG_5485 IMG_5538

 

The arches of the area are developed mostly within the Entrada formation. The weight of this cover caused the salt bed below it to liquefy and thrust up layers of rock into salt domes. As this subsurface movement of salt shaped the landscape, erosion removed the younger rock layers from the surface. Except for isolated remnants, the major formations visible in the park today are the salmon-colored Entrada Sandstone, in which most of the arches form, and the buff-colored Navajo Sandstone. These are visible in layer cake fashion throughout most of the park.

 

IMG_5545 IMG_5559 IMG_5563

 

Over time, water seeped into the surface cracks, joints, and folds of these layers. Ice formed in the fissures, expanding and putting pressure on surrounding rock, breaking off bits and pieces. Winds later cleaned out the loose particles. A series of free-standing fins remained. Wind and water attacked these fins until, in some, the cementing material gave way and chunks of rock tumbled out. Many damaged fins collapsed. Others, with the right degree of hardness and balance, survived despite their missing sections. These became the famous arches.

 

IMG_5591 IMG_5622 IMG_5639

 

Hiking the Devil’s Garden area to sights such as Double O Arch is breathtaking, walking the back’s of the strange fins that remain after millions of years of erosion, following the small cairns through the landscape and breathing in the desert landscapes is wonderful experience.

 

IMG_5662 IMG_5700 IMG_5719

 

As mentioned previously Canyonlands NP covers a huge area and preserves a wilderness of rock at the heart of the Colorado Plateau. Water and gravity, this land’s prime architects, cut flat layers of sedimentary rock into hundreds of canyons, mesas, buttes, fins, arches, and spires. At centre stage are two canyons carved by the Green and Colorado rivers.

 

IMG_5772 IMG_5773 IMG_5784

 

Leave a Reply

Your email address will not be published. Required fields are marked *