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  • C/30/Freq - Progressive Tuesday Reboot #3

C/30/Freq - Progressive Tuesday Reboot #3

  • July 24, 2018
  • 9:00 AM
  • Cline Falls State Park
  • 9

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Progressive Tuesday Reboot #3 

 Ride Classification Leader  GPS My Ride
 C/30/Frequent    Terry Belunes         Link

One of prettiest local rides, this week’s ride is a 30 mile route that starts at Cline Falls State Park, goes north through Redmond, then east to Smith Rock State Park, and then loops back to Clline Falls State Park. The ride is mostly on rural roads, with the except of crossing Highways 126 and 97. The views on this ride are just great!

Smith Rocks are made up of layers of recent basalt flows overlaying older Clarno ash and tuff formations. Approximately 30 million years ago, a large caldera was formed when overlying rock collapsed into an underground lava chamber. This created a huge amount of rock and ash debris that filled the caldera. That material solidified into rock, becoming Smith Rock tuff. Rhyolite flows intruded along faults in the Smith Rock Tuff. A half million years ago, basalt lava flows from nearby volcanoes covered the older tuff.

Interesting, this route is right in the middle of the Crooked River caldera – a super volcano that erupted about 30 million years ago. The caldera is 17 miles by 25 miles in size and is one of the 10 largest in the world. It includes Smith Rocks, Steins Pillar and Twin Pillars. Even for such a large caldera, it wasn’t discovered until 2005 because it doesn’t look like Crater Lake or Newberry crater. Two well know calderas just down the road.

Questions? Call Terry @ 503.929.1417.

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