EESA06H3 Chapter Notes - Chapter 20: Cyanobacteria, Panthalassa, Baltica
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 canadian shield. 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 labrador. Baffin island remnants of this vast ice sheet still survive on baffin island as penny and. 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.
