EESA06H3 Chapter Notes - Chapter 20: Atmospheric Circulation, Periglaciation, Devonian
12 Apr 2012
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Document Summary
Canada: a young nation, but an old country. Acasta gneiss (4 ma)- north west territories, which forms part of the slave province of the. North america was essentially complete by 65 million years ago. Last ice sheet 12,000 years ago left southern parts of country, 6,000 years ago finally melted in. Baffin island remnants of this vast ice sheet still survive on baffin island as penny and barnes. Craton the ancient core of north america, composed of a complex assemblage of several distinct geologic provinces. Geologic provinces broad regions of similar rocks, with characteristics that differ significantly from rock types present in adjacent areas: sub-provinces fault-bounded units containing similar rocks types, structures and mineral deposits. Terranes provinces + subprovinces, discrete fragments of oceanic or continental material that have been added to a craton at an active margin by accretion (material is added to a landmass) The north american craton versus the canadian shield.
