Split Rock's Split Rock EarthCache
Hidden : 4/30/2008
Difficulty:
1.5 out of 5
Terrain:
1.5 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:

This EarthCache will bring
you to Split Rock Park located 5 miles southwest of
Fredericksburg Iowa.

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This EarthCache will introduce you to an ancient traveler for which Split Rock Park derives its name.




But what is this, and how exactly did it get here?



What you see here is a glacial erratic.

A glacial erratic is a piece of rock that deviates from the size and type of rock native to the area in which it rests; the name "erratic" is based on the errant location of these boulders. These rocks were carried to their current locations by glacial ice, often over hundreds of miles. Erratics can range in size from pebbles to large boulders such as Big Rock in Alberta. Big Rock in Alberta weighs 16500 tons...that is one big rock!

Glacial erratics in Iowa are not difficult to identify. The vast majority are igneous or metamorphic rocks, rather than the usual sedimentary rocks of sandstone, limestone, dolomite, and shale that constitute the bedrock under most of Iowa. If you pick up a granite rock, composed of interlocking crystals of pink feldspar and glassy quartz, you can be sure it is not native and that it came from outside the state, most likely carried by glacial ice, such is the case here at Split Rock Park.



To receive credit for this EarthCache, you will need to complete the following three tasks:

In an email to me-

1. Please measure the height of this erratic at its highest point.

2. Describe to me the way the surface of this erratic feels. (Is it rough, smooth, etc.)

And

3. When logging this EarthCache, please upload a picture of yourself/team with the erratic in the background and your GPS clearly visible. (See Example Below)

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Logs that do not meet these three criteria Will Be Deleted-No Exceptions.

I'd like to thank Dave Sedivec of the Chickasaw County Conservation Board for allowing me to develop this EarthCache in Split Rock Park.

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