Valleys u shaped valley in tracy wilderness

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ite Valley Glaciers Valley • Erode a large quantity of bedrock and sediment • Convert V-shaped stream valleys into Ushaped glacial valleys. U-Shaped Valley in Tracy Wilderness, Southeastern Alaska U-Shaped Valley Seawater Flooded U-Shaped Valleys: Fjords Seawater Valleys: Bela Bela Fjord, BC When glaciers melt, sea-level rises Erosion by Continental Glaciation Erosion • Erosional Landforms much larger in scale than alpine glaciers – Whalebacks – huge Roche Moutonée – Huge U-shaped troughs – Finger Lakes, Great Lakes, Puget Sound, Loch Ness were all once stream valleys excavated by Ice Sheets Erosion of Preglacial Lowlands (Finger Lakes) Erosion Erosion of Lowlands (Great Lakes, Finger Lakes) Erosion Superior M i c h i g a n Huron Ontario Erie Source: U.S. Dept. of Interior, USGS Eros Date Center Glacial Deposits - Drift Glacial • Collectively called Glacial Drift • TYPE 1: UNSORTED • Glacial Till: unsorted, unstratified sediments deposited by melting ice. – May contain glacial erratics – Often accumulates in glacier’s channel and at its terminus as a Moraine: – Terminal Moraine: hills of sediment left by a glacier’s retreat. – Terminal Moraines may be reshaped by a later glacial advance into Drumlins: rounded elongated hills perpendicular to their original orientation Advance & Retreat: Moraines Advance Note moraine, retreat or stationary Stationary Analogy: Escalator Stationary & Retreat: Moraine at Terminus Stationary Large Granite Erratics Lateral and Medial Moraines Lateral Wra...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern