This Fossilised Oyster Shell Bed is in a Cave.

I explore why this cave has a fossilised oyster shell bed inside, and go through the history of how limestone caves are made!
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[@nothinglikeasongbird]

This must be your millionth "Tom Scott brought me here" comment at this point but I've been watching through your videos this time and they're awesome. I know absolutely nothing about caves but your channel's really engaging and interesting and manages to talk about it really effectively (which has to be even more work than it'd already be given you're filming on location, which is phenomenal.) Thankyou so much for making your videos.

[@EliseFreshwaterBlizzard]

thank you! I really appreciate this! It takes me a lot of effort to get ready to film in a cave :)

[@MisterQuacker]

*waves from an oceanic cave* 👋🌊🐚

[@Dakiraun]

Ooooohhhh that is cool! Now see, that's the kinda stuff I had hoped to see when I was caving, but never did. Very amazing (and humbling) when you can see/touch a fossil that you know predates even the dinosaurs.

[@TalLikesThat]

Truly the best channel on KZbin. That's awesome.

[@EliseFreshwaterBlizzard]

Thank you, that means a lot ! :-)

[@devinh.7632]

Im from Ohio and we dont have many caves around here, so this is really cool to see! Thank you!

[@MrGreatplum]

That’s an amazing set of fossils - thank you for sharing with us :)

[@hedrickwetshaves1997]

Thanks for this! QUESTIONS: Do you use a Radon exposure tally sheet? And do cavers ever encounter H2S "sour gas"? If so where or what caves? Also, were you on Tom Scott KZbin Channel? 😀 Keep up the great work! And stay safe. You're Awesome!

[@codespace1337]

Fossils like this are always absolutely fascinating to think about, especially when seen in situ as you're showing here. Excellent video!

[@SkogenWhisper]

That’s soooo awesome

[@VincentGroenewold]

That is actually really really cool! Walking underneath fossils I've actually never seen before

[@Mike_Dubayou]

This is all so cool! How much would it cost to travel from america to go explore britain. I am ok with the cheapest flight, I am ok with getting the cheapest boarding. I just want to travel and explore. Why does it feel like all that costs so much. Anyways, I wish you so much success. I love this content, and you seem like a very genuine person. Much luck to youu!

[@-.._.-_...-_.._-..__..._.-.-.-]

I apparently missed something. How did the seabed end up on the ceiling?

[@groglorb8980]

Either tectonic folding, as on this scale of time and size rock moves a bit like toffee and can be folded over on itself with the forces involved... ...or the bottom of the bed eroded out so you're looking up from underneath.

[@EliseFreshwaterBlizzard]

So, these layers created by the seabed begin to solidify. When the tectonic plates shift, they create these small cracks that the water can get into and begin to erode, creating tubes. (Bc the water is acidic!) It's not that *only* the ceiling was a seabed, the floor and walls was a seabed too, it's just that the layer of oyster fossils stuck happens to be higher up..does this make more sense ? X

[@-.._.-_...-_.._-..__..._.-.-.-]

@@EliseFreshwaterBlizzard Okay, so this what I'm imagining. A long time ago, oysters rested on the top layer of the seabed. That layer of soil and oysters was slowly covered by another layer of soil and oysters. This occurred again and again for millions of years, so the oysters were eventually buried deep beneath the top layer of the seabed. Meanwhile, the layers of soil and oysters were solidifying, aging into solid layers of oyster shells and limestone. Over millions of more years, acidic water seeped through the cracks of those solid layers. Deep below the surface, those cracks widened into cavities, and you're standing in one of those cavities in the video. The oyster fossils are on the ceiling because the layer of soil they once rested on dissolved away. What's above you is still the seabed, but it's the layers of seabed that covered those oysters. Is this correct?

[@EliseFreshwaterBlizzard]

@@-.._.-_...-_.._-..__..._.-.-.- yes, essentially, this is it !!

[@-.._.-_...-_.._-..__..._.-.-.-]

@@EliseFreshwaterBlizzard That is mind blowing.

[@groglorb8980]

Where abouts is this? (if you can say)

[@kylem9476]

Via Gin entrance?

[@yoyoyoghurt]

Maybe I'm in the wrong here, not a paleontologist. But don't oysters appear starting from 260 million years ago, not 360?

[@EliseFreshwaterBlizzard]

Hello! There is a reason I stuck with 360mya ! As general cave instructors, we are taught that the rough date of the starting process was 360 million years ago, where we see these pools (ocean beds) of water begin to develop in the carboniferous period. This does not specify mean that there were oysters in this time period, but it's where we see these shallow sea beds full of life. It's hard to place exact years onto when each layer builds as a sediment, and then solidifies. Therefore, I've always stuck with 360 million as it's the easiest way to explain how it all began :-)

[@IanKjos]

Do us all a favor and don't tell secrets. That's really cool, and great for scientific inquiry.