Geocaching.com


Geocaching

Welcome, Visitor!

Sign In | Create Account

Sign in with Facebook


or

Sign in with Geocaching

Forgot Username/Password

Give the gift of Geocaching Premium

EarthCache

Lake Wapello's Geology.

A cache by bigdoublej
Hidden : 10/3/2012
In Iowa, United States
Difficulty:
2.5 out of 5
Terrain:
2 out of 5

Size: Size: not chosen (not chosen)

Join now to view geocache location details. It's free!

Watch

How Geocaching Works

Please note Use of geocaching.com services is subject to the terms and conditions in our disclaimer.

Geocache Description:

Iowa's landscape varies widely in appearance from place to place across the state. Individual landform shapes reflect the diverse effects of deposits left by glaciers, wind, rivers, and seas in the geologic past.

This EarthCache will cover two of these contributing factors.

The Sea and Glaciers.
Photobucket
This area that you are standing right now is called the Paleozoic Plateau.
Any sandstone that you encounter in this area originated as sediment on tropical sea floors between 300 and 550 million years ago.
The formation of sandstone involves two principal stages. First, a layer or layers of sand accumulates as the result of sedimentation, either from water (as in a stream, lake, or sea) or from air (as in a desert). Typically, sedimentation occurs by the sand settling out from suspension; i.e., ceasing to be rolled or bounced along the bottom of a body of water or ground surface. Finally, once it has accumulated, the sand becomes sandstone when it is compacted by pressure of overlying deposits and cemented by the precipitation of minerals within the pore spaces between sand grains.
Much later (14,000 - 70,000 years before the present), several different glacial advances covered different parts of Iowa and buried most of the sedimentary bedrock foundation from view. Materials near the land surface accumulate during glacial episodes. These materials include loess (deposits of wind-blown silt) and alluvium (sand and gravel transported by glacial meltwater streams and rocks transported by the glaciers themselves).
These rocks that you will encounter that were deposited by glacial processes are granite.
Granite is an igneous rock and is formed from magma. Granite is not native to this area, these rocks were carried to their current locations by glacial ice, often over hundreds of miles.

To receive credit for this EarthCache, you will visit two waypoints and apply what you have learned to identify the rock present.
1. At the posted coordinates-
Identify this rock type.
Of the three main rock classifications (Igneous, Sedimentary, and Metamorphic), what type is this?

2. Now move to
N40 49.206 W092 35.462-

Identify this rock type.
Of the three main rock classifications (Igneous, Sedimentary, and Metamorphic), what type is this?

3. Now, using what you learned in this EarthCache's write up, which of these two rocks
"arrived on the scene" first?


I would like to thank Ron Moore-Lake Wapello State Park Manager,
for granting me permission to develop this EarthCache.


Photobucket

Additional Hints (No hints available.)

Advertising with Us

Inventory

There are no Trackables in this cache.

 

Find...

46 Logged Visits

Found it 44     Publish Listing 1     Owner Maintenance 1     

View Logbook | View the Image Gallery of 12 images

**Warning! Spoilers may be included in the descriptions or links.

Current Time:
Last Updated: on 10/7/2014 12:36:08 PM Pacific Daylight Time (7:36 PM GMT)
Rendered From:Unknown
Coordinates are in the WGS84 datum