Have a Gneiss Day
This entry was posted on 1/18/2007 5:07 PM and is filed under uncategorized.
"Some of the oldest rocks in the world include the gneiss found in the Minnesota River Valley. The
Morton Gneiss, which is 3.6 billion years old, is a coarsely crystalline, foliated metamorphic rock... Gneiss is quarried for use as building stone and monuments. You can find outcrops of gneiss near Morton (the famous “
Rainbow Gneiss”), Redwood Falls, Sacred Heart and Ortonville." - from the U of Minnesota's site
Gneiss is pronounced nice. Cold Spring Granite Incorporated still quarries what is also called
Rainbow Granite from Morton.
It's my guess that the Minnesota River Valley which really cuts deeply into the land at Morton, is the reason that the granite is accessible.
