eco FINALLLL pt 2

• paleocology; the study of the geological and biological processes that have shaped the Earth's surface

  fossils

  records of the past

  sediments/ tree rings
• tree ring analysis

  ring width= influenced by temperature drought pest

  large xylem vessels during fast growth
• coring

  taking out inside of tree small sample to run analysis

  narrow rings= dry szn cold szn

  volcano eruption causes this too

  rings can show up to 10 000 years, white cedar 1000 yrs old
• sediment cores collected and studied

  organism and physicochemical enviro history

  counting layers or radioactive isotopes

  
  

  sediment= autochthonous, sediment deposit in that area

  allochthonous, sediment deposit from far distance to present location
• diatoms cell walls= past lake conditions

  indicate drought conditions= early years = more drought

  ice covers = less abundance of diatoms, open water = high abundance

  acidifiction (so2)