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31 Cards in this Set
- Front
- Back
The west side of the Continental Divide receives more precipitation than the east side due to the:
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Rain shadow effect |
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What are most of the rocks in the park? |
Precamrian-aged metasedimentary rocks |
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What name is given to the thick sequence of bedrock in the park? |
Belt Supergroup |
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In what type of environment were these rocks deposited? |
Shallow rifting sea |
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The fine-grained rocks such as the mudstones were lightly metamorphosed to a rock between a chale (a poorly-lithified sedimentary rock) and a slate (a low-grade metamorphic rock). This rock is called: |
argillite |
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The "cabbafe hear" structures seen in some of the rocks in the park are: |
fossil stromatolites |
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Stromatolites are evidence of: |
colonies of blue-green algae |
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Some of the rocks in tha park are green due to: |
copper |
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What type of environement is indicated by the presence of pillow basalts? |
Water |
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A vesicle in an igneous rock which has been filled in by crystals is called: |
amygdule |
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A horizontal tabular igneous intrusion is called a: |
Sill |
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When a sequence of older rocks is pushed almost horizontally or at a very low angle over a sequence of younger roks, we call it a: |
Thrust fault |
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The fault that moved the Belt rocks to their present position is called the:
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Lewis Overthrust |
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A structural window, such as the North Fork Valley, where one can "see" through a thrust sheet to the younger rocks below is called a:
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fenster |
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An erosional outlier, such as Chief Mountain, where erosion has separated a block from the rest of the thrust sheet, is called a:
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klippe |
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What other large structures characterizes Glacier Park? |
a syncline |
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Along the east side of the park, alpine glaciers joined together and spread out, forming a ____________ glacier.
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Piedmont |
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A lake that fills the depression at the head of a glacial valley |
tarn |
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a knife-sharp ridge between two glacial valleys |
arete |
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a bowl-shaped depression at the head of a glacial valley |
cirque |
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a low area on the ridge between two glacial valleys |
col |
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Small tributary glacial valleys high above the main glacial trough |
hanging valleys |
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Scratches left in the bedrock after a glacier scrapes over it |
Glacial striations |
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a string of lakes filling depressions in a glacial trough |
paternoster lakes |
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a sharp pyramid-shaped peak |
horn |
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A pile of loose debris at the foot of a cliff is called a:
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talus slope |
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The stream channels carrying meltwater from the glacier may become choked with sediment and form an intertwined branching pattern called:
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braided |
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True or False: An alpine glacier carves a wide U-shaped valley called a glacial trough
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True |
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True or False: Meltwater coming off a glacier has a beautiful crystal clear appearance because there is no fine-grained sediment in it.
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false |
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True or False: Most glaciers in the park are growing larger.
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False |
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True or False: Glacial debris which piles up at the front or sides of a glacier is called a moraine.
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True |