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7 Souvenirs of August

EarthCache

Diabase Dikes – Schoodic Point, Acadia NP

Hidden : 11/1/2006
In Maine, United States
Difficulty:
1 out of 5
Terrain:
1.5 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:

Schoodic Point is located in the mainland unit of Acadia NP, about an hour northeast of the main park. There is a parking area with facilities adjacent to the earthcache. The dikes are viewable from the parking lot, but to see the best examples you will need to explore the rock surfaces. Be extremely careful near the cliffs, people have been swept off the rocky shoreline by rogue waves. Rocks may be slippery.

Be extremely careful near the cliffs, people have been swept off the rocky shoreline by rogue waves. Rocks may be slippery.

Schoodic Point is a peninsula of granite. The granite is light gray with a slight pink tinge. Cutting through the granite are dikes of dark diabase. Granite and diabase are both igneous rocks that form from the cooling of magma. The USGS has a good set of graphics on their website.

At Schoodic Point, the granite was formed first as one large mass. Fractures formed in the granite were later filled by molten rock (magma). The magma cooled quickly to form the diabase dikes.

As you walk over the rocks you can find examples where the granite on opposite sides of a dike would fit together like puzzle pieces if they were not separated by the diabase. There are also pieces of granite broken off from the sides of the fracture that were frozen in the middle of the dike. A very close examination of the edges of some of the dikes shows streaks that formed in the flowing magma.

You can also find examples of the different strengths of the diabase and granite. Find a spot where a dike extends into the ocean. (Again, don’t go any farther than is safe.) The harder rock erodes more slowly and extends farther into the ocean.

Logging requirements:
Send me a note with :

  1. The text "GCZ5FP Diabase Dikes – Schoodic Point, Acadia NP" on the first line
  2. The number of people in your group and if anyone is logging separately, their login name(s).
  3. The relative hardness of the two types of rocks at the point based on how easily they are eroded by the waves
  4. The width of the dike at the coordinates. If you are physically unable to reach the coordinates, estimate the width of one of the accessable dikes.
  5. Be sure to check the box to include your email address with your message so that I can send you the OK to log. Any logs posted before I receive your email and qualify your find or logs containing spoilers will be deleted without prior notice.

    The above information was compiled from the following sources:

    • -Maine Geological Survey, Department of Conservation, Basalt Dikes at Schoodic Point, Acadia National Park, http://www.state.me.us/doc/nrimc/mgs/explore/bedrock/sites/nov04.htm, last updated 10/6/2005
    • -Gilman, Richard A., Carleton A. Chapman, Thomas V. Lowell, Harold W. Borns, Jr., The geology of Mount Desert Island A Visitor’s Guide to the Geology of Acadia National Park, Maine Geological Survey Department of Conservation, 1988
    • -National Park Service, Acadia National Park, Geologic Database to accompany digital geologic maps, acadglg.hlp, version 2004-02-02; 16:11 MST

    This is a National Park Service-approved earthcache site. The information here has been reviewed and approved by the Acadia National Park staff. Thanks to the staff for their assistance.


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Inventory

There are no Trackables in this cache.

 

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217 Logged Visits

Found it 214     Write note 2     Publish Listing 1     

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Current Time:
Last Updated: on 7/28/2014 12:40:27 PM Pacific Daylight Time (7:40 PM GMT)
Rendered From:Unknown
Coordinates are in the WGS84 datum