I grew up on a river terrace near the Carpathians where digging down only a couple feet would reveal a thick layer of gravel and smooth boulders but it never crossed my mind that the landscape I'm so familiar with could be the result of ancient glaciers. I'm a forestry major and your videos are my favorite way to learn about geology, thank you!

I survived the looming Ice Age scare of the 1970's. Got the T-shirt to prove it. 😁

As a Missourian turned British Columbian, this was one of the most fascinating portions of my Fishers degree. The contribution of the Milk and Missouri Rivers' intermingling to Western Canada's fish diversity is fascinating. The further damming and shifting of river systems by glaciation and ice dams can be tracked through the fishs' genetics. Thank you for so clearly explaining this from a geological perspective!

I've never been interested in geology, but you, Myron, are my new favorite teacher. Also, the American West is among the most beautiful backdrops one can use to keep viewers interested.

I've canoed the Missouri several times starting at Coal Banks.  I knew the River turns south there but never thought about why.  Now I know.  I also lived a few years in the prairie pot hole region of ND north of the Missouri.  Hundreds and hundreds of pot holes with no creeks or rivers to speak of.  All the runoff is into the potholes.  Thanks Myron.

As an Albertan that has visited the Peace, Saskatchewan, and Mississippi watersheds, I have always been interested in continental divides. Here in Alberta, crossing divides by car, the province has installed signage- Athabasca (Peace) to the Saskatchewan. In Alberta there are 4 watersheds that feed the Pacific, Arctic, Hudson Bay, and the Gulf of Mexico. The Pacific is fed by a small mountain creek, while all the others are navigable, even the MIlk River down by Foremost Alberta. When I saw the Missouri up close, I was taken aback. Beautiful Rocky mountain river, like the Saskatchewan and Athabasca, both initiated by glacial feed.

I marvel at your knowledge and I appreciate the topics you bring to us. I feel so much smarter for watching your videos. Thank you for the effort you put into these!

The course of the Ohio River was also reversed during these glacial advances.  The Ohio Valley is lined with deep gravel beds filled in from the glacial discharge.  Your explanation of the reversal of the Missouri correlates nicely with the Ohio.

What a great lesson by a person who enjoys this line of work and has the biggest smile sharing the geological history of the Missouri River system.

I appreciate the time it must take to create these videos. Thank you for driving to theses special spots. From the drone, the Google Earth shots and my favorite white board, you make terrific content. I just love the story of earth!

I live in British Columbia where the headwaters of the Columbia River are. Many years ago I fished there for Trout and Rocky Mtn Whitefish and it’s only about 50ft wide and a few feet deep. Some places in Oregon it’s 1000 ft deep and 1 1/2 miles wide at that point. I’ve also been to the headwaters of the Mississippi in Minnesota and it’s just a stream. So are the Assiniboine, Red and north and south Saskatchewan rivers. If I hadn’t seen all those sources I would have never thought they started that small.
Another amazing fact is that the Canadian prairies were once covered by Lake Agassiz and at a small Manitoba town one shore of this massive lake is still visible.

Myron is a true American; one that applies the principles of the enlightenment to the admiration and study of the world's beauty.  Always a pleasure to watch and learn

Just north of Toronto we have the Oak Ridge Moraine, at one time they started cutting down the forest, but it all started to turn to sand dunes without the trees to draw the water up from deep below, so it's protected forest area now.

Best judicious use of drone photography  I've ever experienced. Bravo!.

Another "OH! I get it!!" moment has occurred. You're my favorite professor Myron! What a great video and it's easy to see that you put a lot of time and effort into this one. Thanks friend!

Love these so much. Starting from some local feature and then expanding into huge areas and deep time, its almost a spiritual feeling every time (theres probably a better word for it but). Thank you!

The algorithm led me here. What a great format: not just facts and trivia, but a real science story with a common thread running through it. Great on-location shots too! Instant subscribe

M. Cook your enthusiasm is contagious👍 in Alaska the braided rivers spread over vast areas...in between the glacial melt waters and farther north the eroding permafrost.

When Lake Agassiz broke through the ice dam to the south at the end of the last ice age it completely changed the landscape of the entire Midwest of the United States.More research on this topic would benefit the geological serval for that part of the country.

Wow!  I have floated the river past Coal Banks Landing many times between Fort Benton and Judith landings.  This is very interesting!  Always a great video from Myron, thanks again for sharing your knowledge with us!