
http://sltrib.com/utah/ci_3761462
Life, liberty and the pursuit of good barbecue
I took a random scoot up the side of Bridge Mountain in Zion Canyon last week. My immediate goals were to reach the base of the Navajo sandstone for some much needed exertion and to scour the talus slopes for dino-prints.
I followed the base of the Navajo ledge eastward into Pine Creek Canyon where I terminated the scoot on the upper switchback right at the entrance to the Zion tunnel. Along the way I took photos of the geologic contact between the Navajo and Kayenta formations, with the intent of illustrating how they interact to bring about the canyon scenery we see today.
Basically it goes sumpfin' like dis here:
The porous and crumbly Navajo sandstone overlies the denser & less permeable Kayenta shale which creates a prominent spring line in Zion Canyon. Famous landmarks that are a direct result of this "contact" are the Weeping Rock, Emerald Pools, Grotto and the hanging gardens of the Narrows. Kayenta is a Navajo word that literally means "place of the springs". This friable shale layer also erodes more quickly, once exposed, causing the softer slabs of sandstone above to overhang. Eventually these precariously perched slabs violently collapse into the canyon depths below causing the thunderous rock falls that Zion is rightfully famous for. In this way the canyon gradually widens as layer upon layer peel off from the walls and are then carried away by the waters of the Rio Virgin.
Simple enough, ain't it?
Cracks form in an over-hanging slab prior to collapse.
The explosion scheduled for June 2 at the Nevada Test Site is part of an effort to design a weapon that can penetrate solid rock formations in which a country might store nuclear weapons or other weapons of mass destruction.
"I am concerned that tests of this magnitude have been planned without providing Nevadans with any information about the possible impact on their health or safety," said Demcratic Sen. Minority Leader Harry Reid in a statement Thursday.
Nevada Test Site spokesman Darwin Morgan said the test will be conducted about 90 miles northwest of Las Vegas, near the center of the former nuclear testing site.
|
"This is nothing that's out of the bounds for us. That's what our expertise is in," he said.
Morgan said the site obtained the required state approvals and air quality permits in January. Officials from the National Nuclear Security Administration, which operates the site, alerted the state's congressional delegation and state government in December.
The Nevada Department of Administration responded with a letter stating: "Your proposal is not in conflict with state plans, goals or objectives."
No elected officials responded to the notice until Thursday, Morgan said. The test site is not required to seek public comment, he said.
"Given the level of contamination in areas where nuclear tests were conducted, I have real concerns about the dust and other pollutants that will be released into the air as a result of this explosion," said U.S. Rep. Shelley Berkley.
Disarmament activist Pete Litster said tests at the site violate international law. Litster, executive director of the Shundahai Network, said the site belongs to the Western Shoshone Indian tribe.