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Stop D: The High Level LRT bridge section (UTM 333280 5934116, NAD 83) Immediately west of the LRT bridge is an small cliff in which are displayed 6-7 m of fine-grained sediment that shows almost horizontal layers, believed to have formed in the last 8000 years. The exposure is parallel to the river, and is preserved from erosion and is accessible because and engineered berm has been constructed between the section and the river. At the top of the section one can see the remnants of a brickyard that operated at the site between 1898 and 1913. A huge flood destroyed the yard in 1915, giving a good impression of the magnitude of peak historic flooding and flows. Within the lower third of the cliff there is a conspicuous whitish layer, and several brown to red layers. Grains in the whitish layer have been dated using isotopes to between 7584- 7682 years before present. This age coincides with the eruption of Mount Mazama, a huge volcano that existed on the site of Crater Lake, Oregon. Deeper layers can seen looking east from the blue pedestrian bridge. Looking immediately to the east and just above river level, one can see much coarser sediments that underlie those in the section: rounded cobbles and boulders. These are glacial sediments that relate to the northeastward retreat of the Laurentide Ice Sheet from the Edmonton area, approximately 12 000 years ago. After ice retreat, the North Saskatchewan River began incising the river valley, leaving conspicuous terraces visible especially on the North bank. These terraces formed during intervals when the river's post-glacial down-cutting ceased or slowed down. Explain the likely origin(s) of the silty sediments exposed in the section immediately west of the bridges, and in particular the white horizon and several dark horizons. For the white horizon make sure to indicate its age and the event that is responsible for producing it. A▾ B I £3

Stop D: The High Level LRT bridge section (UTM 333280 5934116, NAD 83) Immediately west of the LRT bridge is an small cliff in which are displayed 6-7 m of fine-grained sediment that shows almost horizontal layers, believed to have formed in the last 8000 years. The exposure is parallel to the river, and is preserved from erosion and is accessible because and engineered berm has been constructed between the section and the river. At the top of the section one can see the remnants of a brickyard that operated at the site between 1898 and 1913. A huge flood destroyed the yard in 1915, giving a good impression of the magnitude of peak historic flooding and flows. Within the lower third of the cliff there is a conspicuous whitish layer, and several brown to red layers. Grains in the whitish layer have been dated using isotopes to between 7584- 7682 years before present. This age coincides with the eruption of Mount Mazama, a huge volcano that existed on the site of Crater Lake, Oregon. Deeper layers can seen looking east from the blue pedestrian bridge. Looking immediately to the east and just above river level, one can see much coarser sediments that underlie those in the section: rounded cobbles and boulders. These are glacial sediments that relate to the northeastward retreat of the Laurentide Ice Sheet from the Edmonton area, approximately 12 000 years ago. After ice retreat, the North Saskatchewan River began incising the river valley, leaving conspicuous terraces visible especially on the North bank. These terraces formed during intervals when the river's post-glacial down-cutting ceased or slowed down. Explain the likely origin(s) of the silty sediments exposed in the section immediately west of the bridges, and in particular the white horizon and several dark horizons. For the white horizon make sure to indicate its age and the event that is responsible for producing it. A▾ B I £3

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Stop D: The High Level LRT bridge section (UTM 333280 5934116, NAD 83) Immediately west of the LRT bridge is an small cliff in which are displayed 6-7 m of fine-grained sediment that shows almost horizontal layers, believed to have formed in the last 8000 years. The exposure is parallel to the river, and is preserved from erosion and is accessible because and engineered berm has been constructed between the section and the river. At the top of the section one can see the remnants of a brickyard that operated at the site between 1898 and 1913. A huge flood destroyed the yard in 1915, giving a good impression of the magnitude of peak historic flooding and flows. Within the lower third of the cliff there is a conspicuous whitish layer, and several brown to red layers. Grains in the whitish layer have been dated using isotopes to between 7584- 7682 years before present. This age coincides with the eruption of Mount Mazama, a huge volcano that existed on the site of Crater Lake, Oregon. Deeper layers can seen looking east from the blue pedestrian bridge. Looking immediately to the east and just above river level, one can see much coarser sediments that underlie those in the section: rounded cobbles and boulders. These are glacial sediments that relate to the northeastward retreat of the Laurentide Ice Sheet from the Edmonton area, approximately 12 000 years ago. After ice retreat, the North Saskatchewan River began incising the river valley, leaving conspicuous terraces visible especially on the North bank. These terraces formed during intervals when the river's post-glacial down-cutting ceased or slowed down. Explain the likely origin(s) of the silty sediments exposed in the section immediately west of the bridges, and in particular the white horizon and several dark horizons. For the white horizon make sure to indicate its age and the event that is responsible for producing it. A- I
Transcribed Image Text:Stop D: The High Level LRT bridge section (UTM 333280 5934116, NAD 83) Immediately west of the LRT bridge is an small cliff in which are displayed 6-7 m of fine-grained sediment that shows almost horizontal layers, believed to have formed in the last 8000 years. The exposure is parallel to the river, and is preserved from erosion and is accessible because and engineered berm has been constructed between the section and the river. At the top of the section one can see the remnants of a brickyard that operated at the site between 1898 and 1913. A huge flood destroyed the yard in 1915, giving a good impression of the magnitude of peak historic flooding and flows. Within the lower third of the cliff there is a conspicuous whitish layer, and several brown to red layers. Grains in the whitish layer have been dated using isotopes to between 7584- 7682 years before present. This age coincides with the eruption of Mount Mazama, a huge volcano that existed on the site of Crater Lake, Oregon. Deeper layers can seen looking east from the blue pedestrian bridge. Looking immediately to the east and just above river level, one can see much coarser sediments that underlie those in the section: rounded cobbles and boulders. These are glacial sediments that relate to the northeastward retreat of the Laurentide Ice Sheet from the Edmonton area, approximately 12 000 years ago. After ice retreat, the North Saskatchewan River began incising the river valley, leaving conspicuous terraces visible especially on the North bank. These terraces formed during intervals when the river's post-glacial down-cutting ceased or slowed down. Explain the likely origin(s) of the silty sediments exposed in the section immediately west of the bridges, and in particular the white horizon and several dark horizons. For the white horizon make sure to indicate its age and the event that is responsible for producing it. A- I
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