Ancient Periods

Question 1

Carboniferous period

Answer 1

-spike in oxygen levels due to increased plant growth and photosynthesis which allowed for large arthropods
-carbon levels 180-400 ppm
-big coal beds

Question 2

Devonian period

Answer 2

-“greening” caused carbon levels to drop to 400ppm -> mass extinction
-high C02 levels of 4000ppm
-early Devonian period -> non-vascular plants and protracheophytes existed
-late Devonian period -> lycophytes, ferns, horsetails

Question 3

Silurian period

Answer 3

-high C02 levels 4500 ppm
-violent storms and dramatic climate
-first boney fish
-multiple extinction events