[pct-l] Oregon Sec B update

[RJ Lewis]

The term for the rock you guys are describing is "Scoria". Scoria is a 
basaltic, volcanic rock full of air holes. Unlike pumice, it doesn't 
float.  They use it on the highways cause it's tough wearing- but also 
tough on the tires of your car. :(   (and your shoes!!)  My hubby is a 
road construction vetran in his 34th season, and thought you guys might 
appreciate knowing that.

Peace!
SoulSista



Eric Lee wrote:
> Tortoise wrote:
>   
> If I recall correctly from my visit to Craters of the Moon National 
> Monument last summer, when the  basalt is first broken it is the rusty 
> red color you see and then it eventually changes to the dark brown one 
> usually sees.
>   
>
>
> Hmmm.  I don't think that's right, actually.  Most basalt starts out
> dark-colored but may, depending on its iron content, weather to a red color.
> Cinders, with their high surface area, tend to weather faster and more
> thoroughly.  That area does have a lot of red cinders that are used for
> highway construction and the like.  Sometimes you can even see red paved
> roads.
>
> See this link, for example:
> http://skywalker.cochise.edu/wellerr/rocks/igrx/basaltQ.htm
>
> Disclaimer: I'm not a geologist.  :-)
>
> The trail through the lava fields was covered with red cinders probably
> because they're easy to dig out and relatively light to transport.
>
> Eric
>
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