Gesteentetuin EarthCache
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The Rock Garden (Gesteentetuin) Gives you information on the erratics brouht here during the Glacial Periods.
Here in the Rock Garden (Gesteentetuin), you can find information about various rocks.
- Ingneous rocks
- Gabbro and Dorite
- Extrusive rocks
- Sedimentary rocks
- Metamorphic rocks
You even can find information about the
- Glacial till
- Origin of rocks
- The use of Erratics
Erratics
The Rocks here are called erratics. They were brought here by the ice sheets that covered the land al the way from Scandinavia during the ice ages. The Last deposits date from 120.000 years ago.
Rocks and their age
Rock scan be dated by the decay of radio-active minerals in them. Because of their great age, granites from Uppsala region Sweden are also refered to as ‘Archoic granites’
Weathering
During their long life the rocks were exposed to harsh conditions of wear and tear. They were crushed under the ice and transported in rivers. And even now they are exposed to the daily cycle of heating and cooling, in the end they will break down into sands, clays and fine till.
To log this Earthcache please walk around in the Rock Garden to find the answers of the next questions:
1. From how many areas are rocks in the garden?
2. Where did the fisherman use the erratics for?
3. Make a photo of you and your GPSr between “Boot Noord en Boot Zuid” and place this photo by your log.
4. Send me the coordinates of the pole near the Extrusive rocks
Send the answers to me via my profile page and log the cache, if the answers are incorrect I will send you a e-mail
Enjoy your walk through the RockGarden (Gesteentetuin)
You can do this cache during this cache "Oud in Nieuw land (1) Schokland" as well.
Additional Hints
(No hints available.)