The Rocks Under Wellington
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- Опубликовано: 16 сен 2024
- Geologist Matt Ryan shows us the rocks under Wellington City that have been retrieved by geological drilling. The rock cores reveal that there have been lakes, rivers and even layers of volcanic ash from eruptions at Taupo volcano. We can also see huge environmental changes such as glacial and interglacial cycles recorded in the layers.
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Thanks for that great presentation Matt. Comprehensive & very informative, not to mention so soothing on the ears.
Thanks for your comment!
I love that hearing about a possible end of species event, in the future of the planet, was soothing to your ears. I wonder what the global consequences of a future supervolcano would be if humans are still inhabiting our planet? It's not like we could do anything to prevent it. It's almost reassuring to think that Taupo is the world's most recent supervolcano eruption, 'if' that equates to the next one being somewhere else.
@@TrevorDennis100 Chill out dude. Your misinterpretation of my comment I accept..but soothing was in reference to his voice, not the inevitability of pending doom. Have a lovely day.
Taupo... it gets everywhere. I kind of love that we can draw a line in the sand (and soil, and rock) and say "this was a really exciting time"
More than just a bit exciting in the case of the Taupo eruption!
"May you live in interesting times" 😄👍
Nice to see you got Matt involved Julian!
:-)
Superb programming… who would have known! And well done the creative idea, ‘let’s do a series about our geology.’
Thanks for your comment!
Amazing video, we hear a lot about the Oruanui eruption, but not the Whakamaru eruption. we can only imagine the effect another VEi8 would have had
As a Wellingtonian, eye have found this Deeply! informive.. .
Thank you for this information 😎🙏
Thank you - that's great!
@@OutThereLearning 😎👌
Another great presentation by out there learning.
Too bad Geoscience Australia are not on par with our New Zealand cousins. Looking forward to your next episode of knowledge.
Cheers and best wishes from Australia.
🇭🇲😀👍🍻🍻
Thanks so much for your appreciative comment. Sounds like I need to do an ozzy tour 😉
I have (had?) no interest in rocks, but this channel and presentations about Washington (state) from Nick Zentner have made me fascinated with looking at the landscape. Here in Western Australia, everything is just boring sand dunes. Gotta get to NZ and Seattle.
Watching from Fiji! Really, really interesting videos and informative! Thank you.
Thank you, that's great
Incredibly interesting. I somehow thought that given all the faulting in Wellington and the “rotten” rock that you see in earth works that the ground would be more of a soup than these amazingly distinct layers. Where exactly was the core taken ?
Thanks for liking the video! It was drilled near Vivian Street.
@@OutThereLearning wouldn't it be more conclusive if there were numerous samples from around the Wellington City? Vivian St is on a hill, Lower Willis Street area was reclaimed land by building it up (definitely wouldn't mind seeing those sample).
@@OutThereLearning not surprised you start some meters down as when I was working in Willis street back in the 1980's and there was a lot of new buildings going up, mostly ram
pilling for months, the earth that was being exposed from under the old buildings and down further was really horrid and stinky!
@@hOurworld11 We have numerous samples all over Wellington, was just too much to show all in one video 🙂. They do vary, but mainly in the depth to basement, and the thickness of each layer produced by the varied environment of deposition.
I watched this whole video. Great job presenting this material. You made dirt very interesting. 👍🏽
Nice!
The Taupo eruptions spread , was a bit of a surprise - I've often wondered how tall it was before that eruption considering most roads into or out of Taupo , to anywhere but NE , tend to be quite decent drops over the heavy material to the vent .
The other findings , make much sense , considering the city's topography these days - most folks only see the Hutt River , as the 'fresh water' flowing into the harbour , yet fail to realize the number of springs , collecting as tributary s , at various points around most of the harbour , via the storm water system , except the Kaiwharawhara stream and it's tributarys , would be one of the few open streams into the harbour .
Noticed on the tracks in the Bush reserves , many while 'stoney' , have a large amount of soft material around a lot of the rocks which the city's built on . Would these sediments at altitude , have at a distant historic time , have been part of those lakes etc you mentioned ? .
Thanks for your thoughts. The soft material you see in the hills could be highly weathered greywacke that has become clay. It could also be loess (airborne silt) which piled up in places when the landscape was less vegetated during the cold and windy ice age.
Really interesting and very well presented. Thank you.
Cheers!
Wot the heck have I been missing for 2yrs . Binge watch my only medicine . Thanks.
We had a earthquake last night, with a few after quakes, 😠. Lake Taupo.
Great production on this one.
Thanks Oliver
Clear presentation easily understood. Thanks Matt
Thanks for your comment!
This might be the first time I learned about rocks under welly that wasn't just my dad sorting the hangi pit
:-)
Got to see more videos like this. A good explanation of how the earth formed. Thanks!
Great!
Thank you.
My pleasure
It’s amazing how staff just goes under ground
🙂
it must be so exciting when these come out of the ground!
Another great vid, thanks :)
Cheers!
Amazing channel!
Thank you!
Interesting thanks.
Glad you found it interesting. Thanks for saying so!
Awesome video.
Thank you
Very interesting! I’m curious to know what kind of rocks and sediments you find in the region - any tips for finding clay? Or feldspars?
As a former driller, I can honestly tell you that there are plenty of feldspar rich clays in the wellington area. I remember drilling through a thick seam in the Ngaio gorge.
I keep waiting for the deadpan satire that that moustache demands....
haha - maybe next time!
thank you
Cheers!
This would make a good book on pre-human Wellington.
Cheers!
This is such a brilliant explanation of the processes of the earth. I really want to study Geosciences in NZ! Is Wellington a good place for this?
Absolutely!
great one!! thank you
Cheers!
Hey brother how's it going ? I remember you from the Upper Hutt pools, do you still use the sauna there ?
I have a question about the time frames. There is a large layer holding those glass particles and I think you said it covered a huge time, but if it was from a volcanic eruption wouldn't that take just a few years to deposit? Are layers generally slow building or is it more common to have fast layer deposition followed by long boring bits where nothing much happens? I remember an old Landmark TV series that suggested NZ geology was the latter - extreme events separated by nothing much.
You are correct that the eruption layer would have been deposited in a relatively short space of time spread over multiple phases of the eruption. These several phases were probably separated by weeks or months. Also I think you are right that lots of dramatic geological events are interspersed with long periods with comparably little change occuring. Think of earthquakes, volcanic eruptions, landslides and floods. They are short lived but can have a huge impact
Very interesting, must be pretty exciting getting all this succession of sediments just waiting to be examined . I see you were about 70 metres down when you found the Basement rocks, I wonder what type of rock that might be ?
Thanks for your comment. Greywacke sandstone and siltstone, as seen in outcrops all around the coast of Welllington
Look Matt, as an Aussie, I apologise that Australia is faulting Wellington. We don't mean it. Certainly not over here in Fremantle.
😄
Awesome video
Thanks!
Helllllo Matt Ryan.
Next time could you include the location of your bore site , surrounding terrain so we get a better sense of scale? Thank you
Thanks for this, really informative. Where was the earlier eruption? I didn't recognise the name. Cheers.
The Whakamaru eruption was just north of Taupo
Wow I live in Wellington and I did not know that wow!!!!
Yep - it is amazing what is beneath our feet!
Wellington Rocks !
😀
@@OutThereLearning I live in Owhiro Bay so Red Rocks is home... Funny how many stand at Red Rocks point and look out at the rocks.. Completely missing the folds in the rock layers in the cliff behind them.
So does this show that the planet naturally goes through heating and cooling cycles of your to 5-6 degrees?
It does. Video coming up soon about that :-)
Would love to see a video at White Island
Since the tragic eruption access has been prohibited to the public, so not possible at present
What causes the time-break? It seems like its quite a sudden line, missing millions of years.
Thanks for your question. These unconformities occur when erosion has removed a lot of the overlying rock (for example due to submersion under the sea or the erosion of mountains) and then later on new (younger) material is deposited on top, thus creating the apparent time gap.
@@OutThereLearning Thanks, that makes sense!
Interesting!
That time-gap of 150-200 million years or so in the core - what could have caused that?
It seems very odd for a sediment core to have a gap of 150 million years or so with no deposition!
Very keen to hear the reason for that.
Erosion. Was there, now eroded away.
A mega tsunami hit NZ about 200 million years ago - maybe any loose sediment got wiped away ?
Look up "unconformity".
Is this the core from 1WS?
Hi there, no this one isn't the 1WS core, but that one too is very interesting.
Your estimation of time from what i have seen from creation scientist is way different no mention of globel flood .Taupo erupition i think was recorded by Chinese 4000 or 5000 years ago.
Yes - very different!
What is that basement rock??
Greywacke - alternating sandstone and siltstone
Well you haven't answered the questions about building those buildings. How deep and what kind of footings, seismic engineering, materials, height restrictions, etc.?
Well indeed! Thanks for watching
Wow, really missing good solid bedrock
Yep - its all pretty soft either because it is wet sediment or because it has been crushed by the fault
Would that finer sediment lend itself to liquefaction during a strong earthquake?
Yes, particularly if waterlogged
Yep, we used to live in central Chch by the Avon and you could see exactly why so much of that swampy ground turned to soup during the quakes- the silt was like powdered silk, basically. Our old brick cottage exploded! We thank our very limited geological knowledge for forewarning us after a 5-ish quake to gtfo to Dunedin. Myocene trachyandesite is our bedrock now.
Lake Taupõ, say like Toe-pour , not Taw-poe. Cool vid 😎
You are quite right, thank you
These cores are now exposed to the air: oxygen and bacteria. Doesnt that contaminate them and distort the information?
It will affect them slowly - they are kept in a cooler for that reason. But the main features are still clearly identifiable
Or could they release viruses that we are not accustomed to?
ah these rocks are from lower hutt if not they would be from above the hutt
Very interesting. If you discard the incorrect dating, you have a record of very rapid sedimentary formation and volcanism, which matches perfectly with the Genesis global flood sequencing.
Thanks for watching!
I have to call bullshit on your time-scales here. Roman roads in england from 2000 years ago are 12 foot or more underground now so 12 I would say you dont have more than 8000 years total in those core samples.
Thanks for your comment. Sedimentation and erosion rates vary a lot. That's why you have to use dating methods rather than just sediment thickness to tell age.
@@OutThereLearning After spending decades NOT studying this maybe I should STFU but I still dont think those samples constitute millions of years of history.
however, even so, the video was worth watching, very interesting.
So this is similar all over the world as there was a flood.
There have been lots of floods, sea level changes, glaciations, repeated extinctions - the story that the rocks tell is complex and variable which makes geology so interesting. Thanks for watching and your comment
Please improve your Te Reo pronunciation :)
Thanks - good call
I am sorry i just hate to hear the first thing that come out of geologists mouths are millions of years old.
You are free to react however you wish :-)
So one good earthquake and it's bye bye Welly
Not entirely, but also not a great prospect to look forward to!
@@OutThereLearning I hope not! Cuz I live there lol
Check out this technique. NSWS （Nippon Screw Weight System ）
Penetration up to 25m, and 0 to 50N Ｎ value/1ｃｍ
My interest is more about gold geological mineralisation in Victoria Australia & this video has been beneficial as an educational awareness 😃 Awesome 👌
Great!