Ozarks by era: Highlights of geologic history

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Here we briefly summarize ~1.5 billion years of Ozark geologic history at the era level, sharing highlights from the Precambrian, Paleozoic, Mesozoic, and Cenozoic. Although the full story is far more complex, this "bluff notes" version provides a basic grounding in geologic time that we'll build on in future videos for this Geology of the Ozarks series. For example, we don't really cover the complex structural evolution of the Ozarks here, but stay tuned for that story!
-Geology of the Ozarks series playlist: • Geology of the Ozarks
-All graphic design, mapping, and imagery by Ozark Outsider unless otherwise noted: www.ozarkoutsider.com
- Like this video? Consider leaving us a tip via Ko-Fi (no account required): ko-fi.com/ozar...
- Background music: Whiskey Before Breakfast (traditional tune), performed by Eric Reuter on hammered dulcimer (masterworksok.com) and Sarah Davis on guitar.

Опубликовано:

11 сен 2024

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Комментарии : 44

@markmcarthy596 4 месяца назад

I started watching this video unknowingly @1/2 speed from my last view. At first I thought you were drunk or maybe recovering from a stroke. Then I changed the playback speed back to normal. Whew! I’m so glad you’re okay

@ozarkoutsider 4 месяца назад

I'm glad we're okay, too! Thanks for watching.

@mtownzach 8 дней назад

I turned to half speed on purpose and loved it 😅

@TerryBollinger Год назад

Excellent quick coverage of Ozark geology! I knew that my ancestral county (Bollinger) had the only dinosaur skeleton ever found in Missouri, but I never realized _how_ unique Mesozoic deposits are in Missouri. The Ozark uplift must have been catastrophic for erasing the same strata found in abundance out west. One question: Are any of those tsunami deposits still in existence in Missouri? If they exist, I assume they are near the remaining Mesozoic sediments. It's rather fascinating to think that I might have stepped on bits of Chicxulub tsunami debris while visiting my grandparent's home in Bollinger County.

@ozarkoutsider Год назад

Thanks for watching! The tsunami deposit we mentioned was reported in Stoddard County (just south of Bollinger County for non-local readers), technically just outside the Ozarks by most peoples' reckoning, but we figured it was cool enough to mention anyway. Here's a link to one study on the deposit; the full thing is behind a paywall (grrr) but the abstract gives a sense of the basic idea, which is that there's a deposit right at the end of the Cretaceous that has features like tektites (microscopic bits of debris melted by a meteorite impact) and large chunks of Cretaceous rock ripped up and redeposited chaotically. It's interpreted as a "megatsunami deposit", which is amazingly cool. pubs.geoscienceworld.org/gsa/books/book/592/chapter-abstract/3804326/Megatsunami-deposit-in-Cretaceous-Paleogene?redirectedFrom=fulltext

@TerryBollinger Год назад

@@ozarkoutsider wow, thank you!!

@poketech7192 Год назад

Fascinating!

@heidi5047 Год назад

Great video as always!

@peterplotts1238 Год назад

Excellent content. The Ozarks are beautiful, and the region has exciting geology. Thanks for helping me to better understand my mom's home. I grew up in Texas. I want to find something this good about the geology of my home state.

@ozarkoutsider Год назад

You're welcome! Hope you stick around for the rest of the series, we have a lot more content on the way.

@peterplotts1238 Год назад

@@ozarkoutsider Affirmative. Thanks again.

@nebraskamomma Год назад

Another great video

@jordanyukio Год назад

Awesome video

@missourimongoose8858 Год назад

If you ever wanna do any geological tests or anything on the st francis plateau my family has around 1000 acres along the little st francis river on the highest point in madison county

@ozarkoutsider Год назад

What a great resource and legacy! Thanks for your invitation; we appreciated your video sharing the Native American bluff paintings on your land. One of our challenges is finding time to get out into all the places we'd like to (re)visit, both for pleasure and filming. We already have a long backlog of site visits to make for planned content, so would struggle to add new locations in the near-term. But again we really appreciate your invitation and interest, and will keep it in mind. If you want to make more direct contact, or make sure we have your contact info for future, please feel free to email us at the address listed in the About tab on our channel page.

@mozark.hiker_ 8 месяцев назад

Im very curious about the geology around the Little St. Francis river. Would you happen to know anything about the Pinnacles on the Little St. Francis River or do you know if your family’s property is near them? Thanks

@missourimongoose8858 8 месяцев назад

@@mozark.hiker_ our land borders the s bar f boy scout ranch and yes we have some huge rock formations but im not sure what a pinnacle is so imma have to look it up, we have about 2 miles of access to the little st francis that goes all the way to city lake so you could float it if u want, we have a few kayaks and I'd do it with ya lol

@missourimongoose8858 8 месяцев назад

@@mozark.hiker_I looked them up and I'm not sure exactly where those pics were taken but we to have what I call island rocks which are like fingers that grow out of the bluffs and usually have some awesome gnarly cedars on them, we definitely could float to anywhere on the little st francis as long as ur good to drag sometimes and maybe have to cut some stuff out of the way but I'm a arborist so I've got all the saws we would need lol our land starts at deer run on the Madison County side and goes all the way to copper mines road if that helps, love to have ya out sometime to see what we have out here geologically, not to long ago a mining company wanted to check our land and my dad was interested to know what was there but didn't want any mining company to know so he declined the offer lol

@babebreaks Год назад

Love your content

@jmonty Год назад

Would love to hear about your tsunami in South East Missouri!

@ozarkoutsider Год назад

Unfortunately, going deeper into that isn't on our short list, but see the response to Terry for a bit more information. There's just so much to cover!

@triassicpark947 6 месяцев назад

That opening is so wonderful. If you asked me what the ozarks were, I would totally shrug and say something like 'wherever the red ferns grow?', and if you had shown me a picture of and asked me about it, I would have guessed Appalachia all day long.

@ozarkoutsider 6 месяцев назад

Thanks! The Ozarks are something of an extension of Appalachia, but with a lot of distinct twists that make the region unique. Hope you can check out more of our explorations!

@triassicpark947 6 месяцев назад

Fascinating! I will be looking into more

@AndrewFolts Год назад

Are there geometric differences between glacial and non-glacial boulders?

@ozarkoutsider Год назад

To a certain extent...the shortest answer I can give is that glacial boulders tend be more uniformly (or at least randomly) rounded because they've been tumbled and ground down during transport, while the boulders at Elephant Rocks weathered into their current shape more or less in place, by very slow erosion along geometric (often parallel) crack systems in the rock, so they tend to be more elongated with rounded edges. The core point in this context is that Elephant Rocks is at least 50 miles south of the furthest glacial extent, so there's no possible way that glaciers transported any materials down there.

@AndrewFolts Год назад

@@ozarkoutsider Ah, makes sense. I'll have to keep an eye out for that next time I'm traveling around different landscapes.

@toughenupfluffy7294 9 месяцев назад

Didn't elephants put them there? JK :0)@@ozarkoutsider

@TheRealTomWendel 11 месяцев назад

You’ve got me thinking about why it is that this amazing range exists where it does. Some of those same deposits exist elsewhere but without the more dramatic topography of the Ozarks. I need to read up! Thanks.

@ozarkoutsider 11 месяцев назад

The quick answer is that periods of tectonic activity uplifted the bedrock, which subsequently eroded to form today's rugged hill country. We alluded to this briefly in the introductory video to this series (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-956b7Cdt5b0.html ) but will be returning to it in future videos.

@TheRealTomWendel 11 месяцев назад

@@ozarkoutsiderI figured there was an uplift event in there somewhere as that seems to be the general case in range formation, but I wasn’t aware of a tectonic event that would have produced an uplift in that region of North America. I guess I shouldn’t expect to have known given that we’ve only had a theory of plate tectonics for a century and that it was only validated 50 or 60 years ago.

@ozarkoutsider 11 месяцев назад

It's a multi-stage process that involved both uplift from below (creating the dome-like structure of the Ozarks, especially in Missouri) and a collision from the south that created the rumpled folding of the Ouchita Mts. in central Arkansas and also raised the southern Ozarks' Boston Mts. (in northern Arkansas) to be the highest and most rugged terrain in the region. Beyond that answer, stay tuned for when we get back to this over the winter!

@chokedup53 3 месяца назад

wonderful "bluff notes". Where can i go to learn more about the geology of NW Arkansas and SW Missouri?

@ozarkoutsider 3 месяца назад

Hey, great question. We're going to get to that eventually in our series, but these videos are time-consuming to make. As for books, Roadside Geology of Missouri will get you started in the right direction, but there's no equivalent book for Arkansas that we know of. The websites of the Missouri Geological Survey and the Arkansas Office of the State Geologist have some resources, though you'll have to dig a bit to focus on a given area. The lack of better resources is a major reason we started this channel! - mountain-press.com/products/roadside-geology-missouri - dnr.mo.gov/about-us/missouri-geological-survey - www.geology.arkansas.gov

@quiettime1195 11 месяцев назад

Can you cover the formation of the lead belt district

@ozarkoutsider 11 месяцев назад

Thanks for asking! It's definitely on the agenda. We'll be getting back to this series in the winter.

@marvinschildknecht3746 2 месяца назад

Did I miss the part where the mention of the Ozarks being the result of an uplifted plateau?

@ozarkoutsider 2 месяца назад

It's mentioned at 02:57. This is part of a longer series and we'll return to the uplift of the Ozark dome when we reach that stage in the overall story. This is meant to provide the briefest overview we were comfortable with, given how complex the topic is!

@toughenupfluffy7294 9 месяцев назад

Tsunami deposits 1100 miles away from the Chicxulub impact crater. Think about that.

@johnwilliamson5191 2 месяца назад

IT'S CALLED RED GRANITE

@merryhunt9153 4 месяца назад

This is interesting and helpful, but you talk so fast! I slowed you down to .75 and enjoyed the video much more.

@ozarkoutsider 4 месяца назад

That's a fair concern, it's something I've struggled with my whole life. We do try to balance speaking speed with the need for videos to move along at a certain pace to maintain broader viewer interest. Peoples' experiences can be so variable; we sometimes watch videos on 1.5x because they're too slow or rambly for us! I'm glad the .75x worked for you in this case, and we'll continue to try and keep speaking speed and accessibility in mind. For example, later in the Geology of the Ozark series we stopped adding music to the videos to make it easier for people to play them back at different speeds. Thanks for taking the time to provide valuable feedback!

@MarceneLloyd 10 месяцев назад

I was quite interested until the "about a billion years" comment, and realized what I had walked into. But now I'm too annoyed at being sidetracked and distracted by this information, and my increasing awareness of the issue, to continue. So I'm going to get this off my chest and move on my next video. Here's the problem - too many seem to feel it necessary to give (different!) numbers, while viewers are there for a topic. Unless it's about human history where people document what happened and when with VASTLY higher accuracy (and it matters), I don't think I'd find a high percentage of dissenters if I said if you just got on with it and referenced geologic eras by name using phrases like "very old" and "a vary long time ago", and "before that", they would jump up like students studying for a final and holler: "Hey! You forgot to give age numbers!' Yet you, and many others, feel obliged to throw us that bone, anyway. I'm done with school geology, and if I really want a number I know how to find sources to pick one. Please don't be pedantic. It's tedious. I recently was watching some other channels about America, and geography was at least tangentially relevant, yet each one was was apparently too insecure to just get on with the topic, but felt the need to first pull out and show us some big random multi-million year number like magicians with multi-colored rabbits in their hats. I. DON'T. CARE. Seriously, there is no reliable method of dating rocks (all have MASSIVE irreconcilable variations), unlike carbon dating which can give up to about 6,000 years, with some broad variations. With rocks it's circular - rocks are used to date the fossils, which are used to date the rocks, which are used to date the fossils, which are used to date the rocks, and around and around and around goes the merry-go-round. And almost no one is honest enough to admit it. Phooey! Just get on with sharing cool information, ok? I'm out of here.

@ozarkoutsider 9 месяцев назад

We're going to have to disagree on this; radiometric dating is a well-established method for determining the age of suitable rocks, and there are also well-established methods for estimating the age of rocks that aren't directly datable. Such numbers may have wider or narrow ranges of certainty, but aren't random. You're misunderstanding or misrepresenting how these methods work, but trying to address this would take an overly long comment. To attempt a one-sentence version, using fossils and radiometric dating isn't circular, but progressive: geologists have built an understanding of how different rocks and fossil assemblage relate to one another and use those to develop a logical progression of time that draws on a global set of information. Clear explanations of this subject are easily findable elsewhere; our goal in this channel isn't to provide a complete introduction to geologic concepts. As for your other concern that providing dates is irrelevant or confusing, again, we're just going to have to disagree. To us, rough age estimates are essential to appreciate the majestic scope of geologic history and to properly understand the processes involved. To give just one example, if you're looking at an erosional surface between two bedrock units, it really changes your perception of how that feature developed to know that it represents a gap of 500 million years vs. 1,000,000 years vs. 10,000 years. Asking a geologist not to discuss radiometric dating but just say "older or younger" is sort of like asking an economist not to discuss prices, just "more or less expensive"; the actual values really do matter for proper understanding. Just as it matters whether inflation has raised prices by 10% vs. 100%, it matters whether a given range of geologic time is 10,000 years or 10 million.