Skip to Content

Reviewer notes

Use this space to describe your geocache location, container, and how it's hidden to your reviewer. If you've made changes, tell the reviewer what changes you made. The more they know, the easier it is for them to publish your geocache. This note will not be visible to the public when your geocache is published.

EarthCache

The Secret of Limestone

Hidden : 11/3/2008
Difficulty:
1.5 out of 5
Terrain:
4 out of 5

Size: Size: other (other)

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:


The Secret of Limestone



The naturally eroded Limestone Relief of the Algarve

“Algares” (natural Pits) are peculiar forms of relief shaped amongst the limestone rocks that make up the Algarve coastline.

These formations, associated with naturally eroded limestone geomorphology, include a series of cavities with a variety of shapes and sizes. They arose and evolved as a result of both chemical and mechanical erosion over millions of years.

Extensive fracturing of limestone structures encountered in this area facilitates the infiltration of rain water which, due to its high carbon dioxide content becomes acidified and dissolves the limestone. This continual process progressively increases the cracks in both width and depth, and gradually form natural pits, known in Portuguese as “algares”.

Naturally eroded cavities are sometimes filled with reddish colored, sandy-clayey deposits which offer little resistance against sea and land surface erosion. The fast erosion of these deposits in amongst the limestone structure means they are swept away from the coastline, leaving the rocky outline with its intricately sculptured shape, and many conspicuous rocky edges and islets, e.g. the one called Seagull Rock.

In the Lagoa municipal area, the limestone rocks that form these pits and caverns are the basic lithological foundation of the cliffs, and form an extremely attractive stretch of coast.

In December 1999 the collapse of a big cave occured as you can see in the following picture:

The cache:

  • You need to be free from giddiness and wear good shoes. Be careful! You do the cache on your own risk.
  • Park your car at N37 05.261 W8 26.565 and walk along the coast east to N37 05.185 W8 26.358.
  • From this point you get an idea of the terrain and the further way to go.

.

  • Continue your tour to N37 05.190 W8 26.292.
  • You reach the final point at N37 05.173 W8 26.267 on a small path along the steep coast (see picture above). Be careful!

To log this cache mail the anwer of the following question to us.

Questions to answer:
  • What kind of "petrified organism" could you discover on your previous way? What is their significance for the limestone
  • Optional: Log a picture of you exploring the area.

You can continue your tour, if you leave the cave south and climb down the rocks to the plateu. From here on the terrain rating increases to 4!

Have a lot of fun,
road_runner & susi

last update 16.4.2011

Additional Hints (No hints available.)



 

Find...

461 Logged Visits

Found it 437     Didn't find it 5     Write note 13     Temporarily Disable Listing 2     Enable Listing 2     Publish Listing 1     Owner Maintenance 1     

View Logbook | View the Image Gallery of 651 images

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

Current Time:
Last Updated: on 5/8/2018 3:28:48 AM Pacific Daylight Time (10:28 AM GMT)
Rendered From:Unknown
Coordinates are in the WGS84 datum

Return to the Top of the Page