Ampitheater Behind Leatherman...

Ampitheater Behind Leatherman Peak (To the southeast)


Post a Comment
Viewing: 1-7 of 7

Kane - Dec 12, 2003 11:57 am - Voted 10/10

Cool shot



Diggler - Feb 3, 2004 11:38 am - Voted 10/10

funky funky funky

Man that's weird (in a really cool way)- how'd it get striated in that way (if you know)???


IdahoClimber - Feb 4, 2004 1:35 pm - Hasn't voted

Re: funky funky funky

Okay without sounding like too much of a geek . . .

The Lost Rivers are a fault block mountain range, meaning that the earth's crust stretches and pushes the mountains up in relation to the valley floor.

It sits 5,000 feet higher than the valley floor and contains very few lakes.

There was a 7.3 magnitude earthquake in 1983 that raised the mountains by about 6 feet.


Klenke - Feb 4, 2004 3:04 pm - Hasn't voted

Re: funky funky funky

I'm not sure IdahoClimber answered the intent of your question.

The mountains of the Lost River Range are built upon Paleozoic sedimentary strata (Cascadia, p. 262, 1972). Differential erosion between layers of varying hardness is what has caused the terraces to form. The "mountain" range was once a sea floor or sedimentary basin (a geosyncline) that was later uplifted and folded to form the present day range. The Paleozic Era was from 540-250 Million years ago. At that time, the equator (the "Silurian" equator) ran through the Pacific Northwest because North America was farther south than its present day position. In such a tropical environment, sedimentation was much more vigorous.


IdahoClimber - Feb 4, 2004 5:10 pm - Hasn't voted

Re: funky funky funky


Can I put that on my mainpage to explain it better?

I knew it was part of the seafloor by the amount of sealife you see in the rocks.

What is the name of that book?

Great info . . .


Diggler - Feb 4, 2004 6:42 pm - Voted 10/10

Re: funky funky funky

Wow- I would say that satisfies my curiosity pretty well... Interesting geologic past. That is actually quite similar to that of the Sierra Nevada- also a fault-block range, under the sea a long time ago. Difference is, most of the peaks in the Sierra now are composed of the newer granite that formed underneath the sedimentary layer(s). Most of the sedimentary crap (I will call it this as I have had the misfortune of climbing on some of it) has since been eroded away. For an interesting example of a peak where some of the original sedimentary layer is still present on top of the newer (& commonplace) granite, check out this pic of Split Mtn..

How is the integrity of that rock (climbing-wise), anyway (looks suspicious)??


IdahoClimber - Feb 5, 2004 9:32 am - Hasn't voted

Re: funky funky funky

That looks really similar to the Sawtooth's, which have great integrity and an abundance of technical climbing.

As for the Lost River's the rock is crap. Great for scrambling or snow climbs, but very few routes that allow for technical climbing

Viewing: 1-7 of 7