Joshua Tree National Park - Arch Rock - National Parks of the World on Waymarking.com

This natural arch formed in the White Tank Granite. This igneous rock is thought to have pushed its way up into the surrounding Pinto Gneiss between 135 to 155 million years ago creating a large pluton (see other earthcache). This pluton cooled slowly allowing the relatively large crystals of quartz, feldspar, and biotie to form.

Through a variety of erosional processes, an arch was formed in the granite. Jointing (see other earthcache) created lines of weakness in the massive granite pluton. Water dissolved the rock surface and seeped into small cracks where it froze and expanded causing the small cracks to get larger. By chance, the result of the erosion created the arch.

Park Name: Joshua Tree National Park Historic/Cultural Park: no Natural Park: yes Recreation Area: no Wildlife Refuge: no Park Website: [Web Link] Type of Listing: Major Park Feature Fees in Local Currency: 20.00 (listed in local currency) Dates of Access: From: 01/01/2006 To: 12/31/2006 Hiking: yes Camping: yes Bicycling: yes Horseback Riding: no Off-Roading: no Swimming: no Snorkling/Scuba: no Boating: no Rock Climbing: yes Fishing: no Other Park Type not listed above: Not listed Other Type Detail: Not listed Hours available: Not listed Other Activities: Not listed

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Date Logged Log User Rating   08/03/2020 csara visited it 11/04/2017 Agent230 visited it 05/10/2014 knowshorts visited it 02/04/2014 datenhamster visited it 02/24/2010 Picht visited it 05/24/2009 Gryffindor3 visited it 04/20/2009 yoyo ken wrote comment for it 04/19/2009 yoyo ken visited it 04/03/2008 ReZappers visited it 01/21/2008 PeterNoG visited it

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