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Canada (509,856)
EESA06H3 (567)
Nick Eyles (499)
Lecture

Lecture1b

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Department
Environmental Science
Course
EESA06H3
Professor
Nick Eyles
Semester
Summer

Description
• <  200  million  years   • Contain  fossils   LAYER  3:    glacial  sediments  (<  100  000  years)   § Formed  from  Laurentide  Ice  Sheet   • Was  about  3  km  thick   • Like  a  mountain  range  of  ice   • Flowing  outwards  under  its  own  weight   • Responsible  for  moving  erratics   • Important  in  the  hunt  for  resources;  gold,  diamonds,  zinc,  lead   o Ice  has  moved  and  eroded  rock   o Also  has  buried  the  rock  with  sediment   o Look  at  chemistry  of  sediment  for  float   § Dispersed  gold,  mineral  fragments   § Track  it  back  to  its  source   § Need  to  know  the  direction  in  which  ice  was  flowing   • Another  ice  sheet  existed  over  the  rocky  mountains  called  the  Cordilleran  Ice   Sheet   o Complex  interaction  between  it  and  the  Laurentide   o 3  km  of  ice  over  North  America  –  water  that  never  flowed  into  the   oceans   § Sea  level  goes  down  about  150  m   o So  early  humans  were  able  to  get  into  Australia  and  North  America   o Debate  –  some  think  they  used  the  Ice-­‐Free  Corridor   § A  gap  between  the  sheets   § Led  to  Chile  14  000  years  ago   § Idea  is  now  abandoned   o More  likely  that  people  came  down  the  coast   § Due  to  fish,  whale,  seals  –  food   o Got  into  southern  Ontario  while  ice  was  still  present  about  12  000   years  ago   • In  southern  Ontario  there  are  also  ridges  of  sediments  that  were  pushed  up   o Oak  Ridges  Moraine   o Shape  demonstrates  interaction  of  ice  lobes   o Projections  from  the  front  of  the  ice  sheet   o Wrap  around  the  western  edge  of  lake  Ontario   • The  urban  frontier:  some  of  the  fastest  rates  of  environmental  change   anywhere  on  earth   o Hardens  water  sheds   o Creates  lots  of  impermeable  surfaces  like  roads,  roofs,  parking  lots   o Water  runs  off  from  that  landscape  and  lowers  the  water  table   o Not  just  a  quantity  problem   o Runoff  is  also  contaminated   § At  this  time  by  road  salt   § Also  rust  and  aerosols  left  from  cars   § Accumulates  after  now  and  rain  –  the  first  flush   § Poor  quality  of  water  rich  in  metals,  biological  material   • Princ
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