Earth's photosynthetic red edge biosignature could extend back over 2 Gyr ago via cyanobacteria and algae, and 1.2 Gyr ago via lichens.
(2013) Land plant evolutionary timeline: gene effects are secondary to fossil constraints in relaxed clock estimation of age and substitution rates
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Expanding the Timeline for Earth's Photosynthetic Red Edge Biosignature
Earth's photosynthetic red edge biosignature could extend back over 2 Gyr ago via cyanobacteria and algae, and 1.2 Gyr ago via lichens.