MONTANA in PREHISTORY Environment - PowerPoint Presentation

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MONTANA

in

PREHISTORY

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Environment

Montana is a place of broad dimensions and sharp contrasts

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“Treasure State”147,138 square miles

Nation’s fourth largest state

535 miles from east to west

275 miles from north to south

Population of less than a million peopleCountry’s sixth least populated state“acreage state”- lots of land and few people

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Granite Peak- 12,850 feet

Kootenai River- 1,800 feet

Temperatures vary from the very hottest, occasionally over 110 degrees in the far eastern section , to a low of nearly 70 degrees below zero at Rogers Pass near Helena in 1954

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TopographyAlpine peaks of Glacier National Park to rolling plains near the Dakota state line.

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Geologic Past

Sixty million years ago

The mountains of western Montana were formed by massive shifts of the earth’s surface and the explosive spurting of lava through volcanoes and fissures.

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Geologic Past

Ancient seas and lakes rose and fell, covering at various times all of today’s Montana, leaving behind fascinating geological formations and sedimentary deposits of limestone, phosphates, and many other compounds

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Geologic PastGreat swamps formed east of the mountains and were later buried to become coal and oil fields.

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After the

S

eas Receded

Dinosaurs roamed the plains east of the Rockies.

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Fossils found in Montana

Tyrannosaurus fossil

Found north of Jordan in 1908

Judith Basin

Bears Paw Mountains

Rocky Mountain Front in the Two Medicine Formation

Duckbilled Maiasaura

Choteau

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Dinosaurs died off sixty to eighty million years ago at the dawn of the age of mammals.

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Pleistocene Era

Glacial Moving

Glaciers moved south from present day Canada into present day Montana. Four different times the glaciers moved south as far as Great Falls and Glendive. Each time the glaciers melted and receded

Forming U-shaped valleys and causing debris to dam huge lakes.

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Lake Missoula

Flooded all of the valleys west of the Rockies to a depth of 800 feet or greater

Glaciers in the mountains hallowed out and formed wider valleys and more lakes

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Changed WaterwaysMissouri River

First flowed to the Arctic north of Hudson Bay. Ice sheets blocked and shifted it eastward and eventually southward to the Gulf of Mexico.

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Western Montana

Western third of the state has the Rocky Mountains

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Eastern MontanaEastern two thirds of the state are plains

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Continental Divide

Follows the primary mountain chains southward from Glacier National Park to Butte, where it bows westward to the Bitterroot crest like an inverted question mark, then turns south eastward again into Yellowstone Park, enclosing the Beaverhead Basin of southwestern Montana in the Atlantic drainage.

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A continental divide is a line of elevated

terrain

which forms a border between two

watersheds

such that water falling on one side of the line eventually travels to one

ocean

or body of water, and water on the other side travels to another, generally on the opposite side of the

continent

. Because the exact border between bodies of water is usually not clearly defined, the continental divide is not always definite for any continent (The

International Hydrographic Organization

's publication

Limits of Oceans and Seas

defines exact boundaries of oceans, but it is not universally recognized). Moreover, some rivers empty into inland seas, and thus do not end up in the oceans.

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East side of Continental Divide- waters flow east into the Missouri River , which flows into the Mississippi and finally into the Gulf of Mexico.

West side of Continental Divide-

waters flow west into the Columbia River Basin and finally out into the Pacific Ocean.

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Early Immigrants

15 to 20 thousand years ago

Bering land bridge

Following Pleistocene animals

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The Three Ecological Regions of Montana

Driving across Montana is like passing through three different countries. Within its boundaries lie three distinctly different ecologies:

The western region (Columbia Plateau)

The central region (Rocky Mountain Front)

The eastern region (Northern PlainsGeography, climate, and resources have shaped the history and culture of each region differently.

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The Western Region: Rugged Mountains, Forested Ridges, High Precipitation

Western Montana is crumpled into continuous mountains, winding rivers, and thick forests.

Natural Mountain Passes

Wide Fertile Valleys

Precipitation (rain and snow)Rain-average of 15 to 25 inches per yearSnow-some areas more than 300 inches per yearGreener region and supports more vegetation than any other region in the state.

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What to look for:

Montana’s western rivers feed the Columbia River, which flows west to the Pacific Ocean.

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Flathead Lake, encompasses 197 square miles of northwestern Montana, and is the larges natural freshwater body of water west of the Great Lakes

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Ash, elm, cedar, and larch trees grow only in the western region.

Montana Elm

Western Larch

Montana Cedar

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The tallest pine tree in Montana is a 300-year-old ponderosa pine over 180 feet tall, growing near St. Regis

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A grove of giant cedar trees, unlike any other trees in the state, grows near LibbyMost of Montana’s grizzly bears live in western Montana.

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Bear grass and bitterroot (the state flower) grow mostly in the western region.

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Central Region: Isolate Mountains, High Plains, Chinook Winds

Central Montana spreads east from the foothills of the Rocky Mountains. Its small scattered mountain ranges rise above gently rolling plains.

Prominent mountain clusters

Sweetgrass

Hills, the Bear’s Paws, the Little Rockies, the Highwoods

, the Moccasin-

Judiths

, the Big

Snowys

, the

Crazys

, the

Pryors

, the Big and Little Belts and the Bighorns.

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What to look for

Ponderosa pine, Douglas fir and spruce trees cover the mountains, while blue bunch wheatgrass, timothy grass and fescue fill the grasslands

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Lupines, larkspur and Indian blanket flower grow on the hillsides, and prickly pear cactus and sagebrush grow in the lowlands

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Montana’s two largest river systems, the Missouri River and the Yellowstone River, begin in central Montana.

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Mule deer and pronghorn spread throughout the lowlands, with black bear, elk and moose in the forests and hills.

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Pheasants, sage grouse and Hungarian partridge hide in the brush, and hawks, falcons, and eagles soar in the sky.

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Trout, sturgeon and bass are the most important fish species

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Eastern Region: Rolling plains, persistent winds, the endless sky

Almost uninterrupted grassland.

The Missouri Breaks and the badlands in

Makoshika

State Park form two of the most dramatic examples of a landscape sculpted by water and wind erosion.Eastern Montana is dry, windy, and extreme

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Irrigation-Bringing in a supply of water to make farmland more productive

Ranches and farms require more irrigation, more space for grazing, and a little more patience than in the other regions.

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What to look for:

The Fort Peck Dam forms the Fort Peck Reservoir on the Missouri River

The fifth largest human make reservoir in the US.

134 miles long, 220 feet at its deepest and 1,520 miles of shoreline.

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Woody shrubs like juniper thrive in the dry, elevated soils of eastern Montana, while ponderosa pine, Douglas fir and spruce trees grow in the high elevations.

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Symbols of the Treasure StateSymbols help us express feelings like respect for the land, pride in our communities, and a sense of place.

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State Seal

A sunrise shines over snowy mountains

Pick, shovel, plow-symbols of Montana’s mining and farming heritage

Mountains, hills, trees, cliffs, waterfalls, and the Missouri River

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State Flag

Shows the state seal on a blue rectangle with yellow edges.

“MONTANA” was added to the top of the flag in 1981

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State SongThree official state songs

“Montana” -1910

“Montana Melody”-1983

“Montana Lullaby”-2007

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State Gemstones:Agate and Sapphire

Agates from the east

Sapphires from the west

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State Flower:

Bitterroot

Montana Indians used the dried roots of the bitterroot for food and trade

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State Tree:

Ponderosa Pine

The most common pine tree in Montana.

Can grow up to 300 ft tall and 8 ft thick

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State Animal:

Grizzly Bear

Most of the grizzly bears in the Lower 48 states live in Montana

Adult grizzlies can grow to 8 ft long and weigh 1,500 pounds

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State Fossil:

Maiasaura

Montana adopted the Maiasaura as its state fossil after an important discovery at Egg Mountain, near Choteau.

They took care of their babies the way birds do

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State Fish:

Blackspotted Cutthroat Trout

Adopted this fish to help save it from its decline due to overfishing and changes in the environment.

Name comes from the black spots that run down its back

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State bird:

Western Meadowlark

Known for its loud, cheerful song

As big as a robin, with a bright yellow chest and throat under a black collar

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State Butterfly:

The Mourning Cloak

Bright blue shimmering spots along the inner edge of a yellow or beige border characterize the mourning cloak’s dark brown wings

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State grass:

Bluebunch

Wheatgrass

Found all over the state

Good grazing for cattle and sheep

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State Nickname:“The Treasure State” and “Big Sky Country”

Treasure State- state’s valuable minerals, gems and precious metals

1960 Montana also adopted the “Big Sky Country” after a novel called

The Big Sky

by Montana author A.B. Guthrie Jr.

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