While caching nearby, I spotted this cool little spot and thought it would be perfect for an earthcache! Not sure if it has a name, but I've dubbed it 'The Portal', as I'm sure you can tell!
( About 5 minutes after publication, I now realise it's called Elephant Rock, but oh well! )
It is relatively easy to access The Portal; the closest parking is at the waypoint provided, follow one of the trails to the beachfront and walk along the sand to the rock platform. From there, it's a short but slightly slippery walk to GZ. While the cache may be accessible at high tide, we do not recommend it. We comfortably walked the whole way on a 1.7m tide, but the platform would almost certainly be underwater at high tide.
Check the tides before your visit at this link
Geology
The Portal is an example of a Natural Bridge.
Natural Bridges form on the sides of headlands on rough coastlines from the constant hydraulic action (water erosion), as well as abrasion (when waves carry small pieces of sediment, which speed up the erosion process)
Arches form in weaker layers of rock, where there is a section of rock that is less erosion resistant than the surroundings. A small crack forms, usually between 2 layers rock layers, or at a spot which has already begun eroding (pothole, honeycombing, etc). The water and waves crashing into this crack widen and deepen it, eventually forming a larger sea cave.
As the erosion continues, the sea cave erodes through the whole headland, creating a small opening on the other side, which widens until it forms a full tunnel, as evident here. The tunnel will continue to widen and become taller as the erosion from water and other factors occurs, until eventually the roof collapses and the bridge becomes a sea stack or a stump, as shown below.
The Portal is at stage 4 of this process, where it is an arch. Small, but an arch nonetheless.
Questions and Logging Requirements
To log this cache, you will need to answer some questions and take a photo for your online log. You may log your find immediately - we will reply to all messages and emails. If we do not receive your answers and photo within 10-14 days, your log will be deleted. You are welcome to include your photo in your log, just do not give away any of the answers
To answer these questions, you will need to go through a portal to the past and the future! (Or you could use the information above to make some educated guesses 
)
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Question 1
The portal is on a tilt. Estimate the angle of the tilt, and explain why you think it formed at this angle.
Question 2
As the arch continues to erode, what coastal landform will eventually be in its place?
Question 3
As well as water erosion, what other erosive forces have contributed to the formation of this arch? How do you know these forces were at play?
Photo Requirement
Post a photo with your online log similar to the one below, showing yourself or your geocaching username with The Portal, bonus points if you get the bridge in view through the portal :)
