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All About a Canyon EarthCache

This cache has been archived.

GeoawareGBL: A cache owner is required to maintain the cache page, including posted logs, and respond to inquiries. The logging tasks for Earthcaches are a logging requirement to log an Earthcache as Found and as such the cache owner needs to validate each log. Furthermore a cache owner should return to the Geocaching.com web site at least once a month to show activity.

This Earthcache is archived due to non-communication.

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Hidden : 12/17/2008
Difficulty:
3 out of 5
Terrain:
3 out of 5

Size: Size:   not chosen (not chosen)

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Geocache Description:

Access: Four hours drive from Windhoek. A Tourist Permit is obtained from the gate which opens at Sunrise. This Earthcache explores a small canyon from its first incision point to its open end (a distance of about 2.5 km).

Waypoint 1: 24° 31.024’S 15° 48.237’E Park Car near here and walk to Waypoint 2

Waypoint 2: 24° 31.024’S 15° 48.354’E Camel Thorn Tree with Community Weavers Birds Nests. From here walk a few metres south into the main river bed course of the Tsauchab River flowing over rock and strewn with cobbles and boulders of limestone (dark black clasts), quartz and sandstone. The bedrock consists of the same clasts set in a calcareous limestone cement matrix. There is no sign of a canyon here. Turn west to Waypoint 3

Waypoint 3: 24° 31.088’S 15° 48.211’E At this location the bedrock is incised with linear erosive hollows with smooth rounded surfaces 10 to 30 cm depressions marking the first gouges of the canyon.

Waypoint 4: 24° 31.111’S 15° 48.156’E In October 2008 this was the site of the first upstream pot hole. Take care walking to the next waypoint as the holes in the ground are now getting deep.

Waypoint 5: 24° 31.118’S 15° 48.150’E Site of a 2 metre diameter pothole about and 780 cm deep and partly filled with loose sand and pebbles which swirl around in a circular motion eroding the pot in flood water conditions. Note now that some deeper slots occur in the bedrock and some of these are blocked with chockstones. Leave the river course and return to your car but IF YOU ARE A GUEST AT THE LODGE first scramble up to Waypoint 6: 24° 30.933’S 15° 48.226’E. From this point you can see the majority of the Tsauchab River course. To the east the origin of the black limestone clasts seen at Waypoint 2) is seen as a black band in the Great Escarpments some 20 km to the east and at an elevation of about 1500 metres above sea level. The Sesriem Canyon rim is at approximately half this elevation, about 780 metres above mean seal level.

Geodirect has started to build a visitors cairn. Please add one rock to the cairn to record your visit here.

Return to you car and drive to Car Park 2 at Waypoint 7: 24° 31.115’S 15° 48.014’E.
The next session of the excursion will walk some distance west inside the canyon for about 1.5 km. If any of your party does not wish to walk it would be convenient for them to reposition your vehicle at Waypoint 12: 24° 31.109’S 15° 47.273’E which is located at the end of the less commonly used track that continues west from this more popular tourist car park.

After exploring the rim and peering down into the canyon with the other tourists at this location enter the canyon via Waypoint 8: 24° 31.143’S 15° 47.967’E and the steps at Waypoint 9: 24° 31.143’S 15° 47.938’E. Turn east and walk up the canyon to explore. The first 100 metres is a steep sided and straight canyon with walls some 15-20 metres high and a sand piled floor.

At Waypoint 9: 24° 31.146’S 15° 48.020’E is a wider bowl eroded out immediately below car park 2. Large tumbled boulders of Tsondab Sandstone are evident on the floor of the canyon. Farther upstream is a pool of permanent water. Animal tracks and birds droppings indicate the importance of this water source in supporting the wildlife on the area. Look out for small horned adders which also bask around the pool as these are poisonous.

If you choose to wade across the pool you can continue to Waypoint 10: 24° 31.128’S 15° 48.101’E – the farthest accessible point in the narrow and dark gloomy canyon and only about 80 metres from the large pothole visited at Waypoint 5.

Return to Waypoint 9 to explore farther downstream the canyon.

At Waypoint 11: 24° 31.156’S 15° 47.840’E another small tributary river joins the main canyon from the southeast and has cut its own small canyon entrance.

Waypoint 12: 24° 31.159’S 15° 47.733’E. Two arches formed by water and wind erosion form interesting landscape in the north side of the canyon wall. You are requested to post a photograph of these arches to illustrate their rate of erosion over time. Trees are now able to take root and grow within the canyon walls making for a greener and shadier habitat.

Waypoint 13: 24° 31.105’S 15° 47.227’E is an optional exit from the canyon leading to car park 3 . As you approach Waypoint 13 watch out for families of baboons feeding amongst the grasses and shrubs within the canyon, or perched up on the canyon walls watching you walk by. Also look for the Sphinx Head Rock on the north canyon wall downstream of Waypoint 13.

It is strongly recommended you continue walking to Waypoint 14: 24° 30.998’S 15° 47.121’E where the canyon walls give way to gentle sloping valley sides and enjoy a spectacular view of the red sand hills of the Namib Desert to the west.

Waypoint 15: 24° 31.138’S 15° 47.725’E. One last look! Question . At this location What feature do you see below?

Educational Notes The sedimentary rocks of the Tsondab Sandstone are dated as Miocene in age and include clasts of black limestone from the Great Escarpment to the east. This indicates that the Tsondab Sandstone is a fluvial (river) fanglomerate deposited by the Tsauchab River about 30 million years ago. Uplift of the whole region 2 million years ago has resulted in the Tsauchab River down cutting into its own deposits to produce this small but spectacular Sesriem Canyon.

Further reading
Grunert Nicole, 2000, Namibia Fascination of Geology A Travel Guide, ( The Sesriem Canyon pages 144-146) Klaus Hess Publishers
The Roadside Geology of Namibia, revised edition2, by Gabi Schneider, 2008, ISBN 978-443-15084-6, pub Gebruder Borntrager, Stuttgart ( available for Purchase from the Ministry of Minerals and Energy, / The Geological Survey of Namibia, 1 Aviation Road (Eros Airport and opposite the Safari Court Hotel) Windhoek, Namibia

Log the Earthcache To have your Earthcache log validated you are required to post two photographs , one of the Cairn at Waypoint 6 (if you are a guest of the lodge) and one of the arches at Waypoint 12 AND answer the question at Waypoint 15

Additional Hints (No hints available.)