Showing posts with label High Plains. Show all posts
Showing posts with label High Plains. Show all posts

Wednesday, October 22, 2014

Northern Convergence: Leaving a Beautiful Country

How will we deal with the hordes of people from the U.S. trying to invade our borders?
Our trip, the Northern Convergence tour, was not over, but the time had come to cross the border back into the United States from Canada. The trip thus far had been an eye-opener. We had been exploring the "crowded" part of Canada in British Columbia and Alberta, but the land itself exuded wildness and isolation.
We were on the High Plains east of the Rocky Mountains, and had spent the morning at the Head Smashed In Buffalo Jump World Heritage Site, and as gruesome as the name was, it was a fascinating place. From there we headed south to the border crossing at Carway. We figured since it had a name that there would be a town and facilities. We got there, and there was...one building. It was a duty-free souvenir/liquor/tobacco shop, and thank goodness, it had a restroom. Still, there were some picnic tables so we stopped for lunch and had a look around. We also wondered if the authorities were going to let us back into the United States. You never know...in the innocent days before 9/11, we were interrogated about whether we had any "Beanie Babies" in our luggage. I laughed at the question, and the border agent got very serious: "Sir, DO YOU have any Beanie Babies?"
We were not exactly in the High Plains, as the land was broken up into swales and shallow valleys underlain by very soft Cretaceous shale deposits. The shales had been deformed and twisted by the same convergent forces that had lifted the nearby Rocky Mountains, but erosion had smoothed off the sharp edges. The land was semiarid and treeless. More verdant lands could be seen in the distance as we looked westward towards the Rocky Mountains and Waterton-Glacier International Peace Park. Glacier National Park was our next destination.
Chief Mountain was especially prominent on the western horizon. The peak is an outlier of the Rocky Mountains, an isolated upper plate of a thrust fault that had pushed the hard Paleozoic limestones over the softer Cretaceous rock. Erosion had then isolated Chief Mountain as a klippe (see the diagram below).

The mountain was a dramatic welcome back into the United States. We only had a few more days left on our journey, but there was still much to be seen. The story will continue in another post!
Source: http://en.wikipedia.org/wiki/Klippe

Monday, October 20, 2014

"Head Smashed In"... um, sounds like a great place to visit...

The High Plains have their quiet times. Sure, there are the vicious winter storms,  the days when the wind blows hard, and the summer thunderstorms. But other times the wind may be just a light breeze through the grass, maybe a hawk soaring overhead. Or a huge marmot standing guard on a sandstone outcrop. But I can also stand in this place and imagine a similar quiet day a few thousand years ago. It's quiet, but then the ground starts to tremble, and a dust cloud rises over the crest of the low hill. The birds startle and take flight, the marmot dashes for cover, and suddenly over the ridge comes a thundering herd of buffalo. They're stampeding, and the leading animals start to shift directions, but then suddenly a strange figure jumps up, yelling and waving limbs. It might be a wolf, it's hard to tell in the panic, so the herd shifts direction once more. The leaders now realize they are headed for a precipice and they try to stop, but it's too late. They go over the edge, pushed by the animals behind. They impact on the rocks and bones below, most of them dead immediately. In a moment it is over. People emerge from their hiding places and start to butcher and process the meat, bones and hides. It has been a successful hunt and they will have enough food and furs to make it through the difficult winter.
There is a seven story building in this picture. Can you see it?
The First Nations people of Canada and Native Americans of the High Plains depended on the buffalo for survival. They made use of the meat, the fat, the bones, and the hides. But anyone who has ever seen one of these immense animals knows that they would a dangerous adversary in a hunt. They can be as long as eleven feet and weigh a up to a ton. They can easily outrun a human, capable of speeds of 35 miles per hour. Though it was done, bringing one down was a difficult and dangerous proposition.
We were in southern Alberta on our Northern Convergence tour of western Canada, and were making our last stop in the country at Head Smashed In Buffalo Jump World Heritage Site. At Head Smashed In and similar localities, the geology provided a safer way to hunt the animals.
At the edge of the prairies where the mountains rise from the plains, the land is not so flat as it is further east. The convergence far to the west compressed and pushed up the Rocky Mountains. The soft Cretaceous mudstones and sandstones underlying the high plains were also pushed up into broad swales and low hills. Ice, water, and wind exploited fractures in the rock, and erosion ate away at the edges of the hills, exposing vertical cliffs of sandstone. Just such a cliff is exposed in the Porcupine Hills outside of Fort Macleod, Alberta. For at least the last 5,800 years, people have utilized the cliff here to capture and kill buffalo.
A spring emerged from the base of the cliff, providing water at the kill site (the green watercourse is visible in the picture above). The Old Man River flows in the flats below, providing sheltered sites for villages.
Tipis have become such a stereotype that some might think that most Native Americans lived in them. I groan inwardly whenever I see one at "Indian Stores" or southwest tourist traps. But the tipi at Head Smashed In was an appropriate sight. The tipis were an excellent shelter on the windy plains. They were portable, an important consideration for a nomadic people. I know of paleontologists in the region who tried to camp in modern nylon tents, but gave them up for tipis, which were more comfortable and more durable in windstorms.
The site was declared a World Heritage Site in 1981 for its archaeological value. Excavations 39 feet deep in the cliff show a complex history of buffalo hunting going back 5,800 years (two spear points show activity in the area as far back as 9,000 years. The visitor center was constructed to blend in to the landscape, and does so admirably (see the picture above). There are trails to the top of the cliff where some cairns from the hunts can still be found. A trail also loops around the base of the cliff. One of the nice surprises inside the well-designed center was a hallway lined with numerous paintings and artwork by First Nation students representing the oral histories of their culture.

About the name of the place. In the Blackfoot language it is called Estipah-skikikini-kots. Legend has it that a young man decided to watch one of the buffalo hunts from the base of the cliff. He picked a bad spot, and was crushed beneath the weight of the falling animals. The name doesn't exactly inspire confidence in the site as a destination when traveling in the region, but it is indeed a fascinating place to visit. It's full of history, but it is also a place of wide-ranging views and scenic beauty, and despite the name, serenity.

Wednesday, October 15, 2014

Northern Convergence: We'll Call it "Rock": The Okotok Erratic

There is a big rock out on the high prairie near Calgary, Alberta. That all by itself is a bit of strangeness. It's even more strange because it is around a hundred miles (160 km) from the cliff in which it originated, up in the Rocky Mountains in Jasper National Park. The Blackfoot Indians had a creative name for the rock, Okatok, which in their language means, um, "rock". These names always sound better in the original language! For whatever reason, the spelling changed a bit to Okotok.
The Blackfoot people had a great story for how the rock got to this spot, a myth that could have served as the inspiration for the rock monster in the movie "Galaxy Quest". Their legendary trickster Napi was resting on the rock on a hot day, so he left his cloak on the rock, saying "Here, I give you my robe, because you are poor and have let me rest on you. Keep it always". Murphy's Law dictates that it soon got cold, and the rain began, so Napi asked for the return of his robe. The rock refused so Napi grabbed "his" cloak. In a moment, the rock was up and running after him! Napi called on his animal friends, the Bison, Antelope and Deer, and none of them could stop the gigantic rock. When all seemed lost, a bat flew straight at the rock, collided with it, and the rock was split in two! The bat had saved Napi, and got a squashed face for all his trouble (such things have to be explained somehow...).*
A smaller erratic a few hundred yards from the Okotok Erratic
The geologists tell a different story, and were it not for the overwhelming evidence it would seem just as fantastical. During the Pleistocene Ice Ages, the continental ice sheets covered all of the region thousands of feet deep. Up in the Rockies at Jasper a huge rock slide dumped massive boulders onto the surface of the glaciers emanating from the high peaks. The glaciers flowed eastward onto the High Plains, eventually meeting up with the vast ice sheet that originated near Hudson Bay. The two ice sheets didn't mix, so the two "rivers" of ice flowed together towards the south. The gigantic rocks from the cliff in Jasper were dumped in a line many miles long where the glaciers moved together. These isolated boulders are called glacial erratics.
The rock is sometimes claimed as the largest erratic boulder in the world, but I have no way to evaluate the claim. It certainly is huge, and worthy of a visit (it is a few miles southwest of Calgary). The Blackfoot or other First Nation peoples were certainly impressed. Faint pictographs can still be seen on the flanks of the rock.
Pictographs are symbols painted on the rock. Petroglyphs are chipped into the rock.

This is a continuation of our Northern Convergence tour of British Columbia and Alberta. In this case, I guess "convergence" refers to the two masses of glacial ice. We concluded our visit and headed back towards the Rocky Mountains and Crowsnest Pass to check out a not-so-long-ago tragedy. More on that next time.

*The Blackfoot legend is  loosely rephrased from interpretive signs at the park.