Geologic map of Colorado |
Instead of politely informing the OQ that you identify rocks by identifying the texture and mineralogy of the grains (the very basis of every Rocks for Jocks class), Hageman decided to take her readers on a "field trip" of sorts. Yep, according to Laura,
"Colorado has some of the most beautiful rocks. Some rocks are used as tourist attractions and have developed into such large and extraordinary sites."Sure enough, she's gonna take us all to Red Rocks and Garden of the Gods – though why she doesn't think Rocky Mountain National park and Colorado National Monument are worth seeing, we don't know. Oh, sure, Hageman managed to slip a few geology-y words into her verbiage:
- "Garden of the Gods is made up of horizontal sedimentary rocks that were elevated and tilted upward."
- "...in northwestern Colorado... many companies or individuals that will use waterfalls or fountains made up of basalt, which is volcanic rock."
- "...in Denver... There was an amphitheater made up from the red rocks that developed from the earth's movement."
"Search for smaller rocks, such as intrusive igneous rocks. These rocks were formed when they were forced into another older rock during the shifting of the earth and tides in the ocean."That one is a real head-scratcher: is it Laura's thesis that intrusions are small? Better not tell her about the Sierra Nevada batholith... and our staff geologist (yes, we have one) is still trying to figure out what "tides in the ocean" have to do with igneous activity. Oh, and this one's a real winner: Hagemans suggests that you,
"Look for one of the lightest rocks that exists. You can find the pumice rock throughout Colorado, especially near rivers. It is red in color and was formed from lava."
¹ The original has been deleted by Leaf Group, but can still be accessed using the Wayback machine at archive.org. Its URL was ehow.com/how_4464175_identify-rocks-colorado.html
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SI - COLORADO
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