Reconstructing Precambrian pCO2 and pO2 Using Paleosols

Paleosols formed in direct contact with the Earth''s atmosphere, so they can record the composition of the atmosphere through weathering processes and products. Herein we critically review a variety of different approaches for reconstructing atmospheric O2 and CO2 over the past three billion years. Paleosols indicate relatively low CO2 over that time, requiring additional greenhouse forcing to ove...