Glaciation is nothing new…

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Presentation transcript:

Glaciation is nothing new… Quaternary Period glaciations Gowganda glaciation

The last 1.6 Million years: The Quaternary Period Today Quaternary Period About 1.6 Ma

Glacials and Interglacials Ice sheets have advanced and retreated many times during the Quaternary Period Glacials and Interglacials Holocene: current interglacial Wisconsinan: Last major glacial

This bdy: 22-25 ka Woodfordian advance (part of Wisconsin) Illinoian advance

Max Wisconsin ice coverage (Woodfordian)

Ice advances as LOBES

The geography of it…

Accumulation zone Ablation zone

Regelation Movement as supercooled water Pressure melting Refreezing Glacier Flow of ice Bedrock Movement as supercooled water

Possibly done by clasts rolling along bed of glacier

Formation of a Roche Moutonnee

Plucking due to regelation

Regelation Pressure melting Refreezing Glacier Flow of ice Bedrock

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