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Antarctic Evo Evidence (Sirius Till (Age = debated (Most agree 14 Ma, Some…

- - - - Implies deglaciation (+20°C) then reglaciation ~ 3 Ma
    - - based on oxygen isotope data
      - lotsa supporting local evidence ∴ more likely
- - - - Shallow channels (50-200m)
      - Striated bedrock
    - - Channels < 200m wide, Z~50m
      - Weakly dendritic
      - Whalebacks & striations
    - - Anastomosing canyons / channels truncate ES2
      - Longitudinal profiles w many reverse gradients
- - - - Water ejected if sufficient water/pressure builds