Tasman Arch, sea cave roof EarthCache
Tasman Arch, sea cave roof
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Tasman Arch is a naturally occurring arch, - an enlarged cave running from the coast and extending inland
The roof at the landward end of the tunnel has collapsed, but the walls of the cave are too high and the hole too large for a blowhole to form.
The tunnel formed from wave action over millions of years with sand and rock particles hitting the rock face, fragmenting it and forcing air into cracks, causing additional fragmentation.
Due to the roof still being intact over part of the tunnel, an Arch is the main feature here, and allows visitors to walk most of the way around the hole. The arch ceiling is 52.7 m above sea level.
The sediments you see here were deposited during the Carboniferous and Permian geological periods (approx. 300 to 265 million years ago) when this area was a cold sea. Icebergs and streams carried blocks of rock, sand, silt and mud into this area. When the sea finally retreated an extensive sandy plain was formed. Vertical cracks formed due to drying of the sediments and local stress in the Earth’s crust.
If you look at the arch that here are softer layers that are more heavily weathered and harder layers that are less weathered. The harder not so weathered layers stick out a bit
To log this Earthcache, visit this location, and message me via my Geocaching profile with the answers to these questions:
Answer the following:
1. What is the name given to the vertical cracks
2. What is the name of the nearby feature that the (crack) is linked to. (see signs)
3. Walk to the other side of the hole and take a measurement to the given waypoint. This is the width of the hole.
In your log, describe the colours and the shapes of one of the layers at the time of your visit.
You may log once you have sent your message with the answer.
Optional: Photos of you at the location are always welcome.
Additional Hints
(Decrypt)
[To log this Earthcache, visit this location, and message me via my Geocaching profile with the answers to these questions:
Answer the following:
1. What is the name given to the vertical cracks
2. What is the name of the nearby feature that the (crack) is linked to. (see signs)
3. Walk to the other side of the hole and take a measurement to the given waypoint. This is the width of the hole.
In your log, describe the colours and the shapes of one of the layers at the time of your visit.]
Treasures
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