Extended Data Fig. 1: Evolution of Corg/Ptotal ratio of marine siliciclastic sediments from 500 to 400 Ma.
From: Carbon/phosphorus burial ratio reveals a rapid spread of land plants during the Late Ordovician
Corg/Ptotal ratio of siliciclastic sediments in oxic (a), ferruginous (b), and euxinic (c) marine environments. (d) Corg/Ptotal ratio of all siliciclastic sediments. (e) Mean Corg/Ptotal ratio of the same stratigraphic formation within the same region (from the same reference). The number in the top left corner of each figure panel represents the original sample count or formation count. Blue curves and shadings indicate the bin-averaged Corg/Ptotal ratios and their 2 weighted standard deviation (2σ), which are generated through Monte Carlo analysis with weighted bootstrap resampling. Light and dark gray dots represent data points and outliers. Purple dots show the data measured in this study. (f) Proportion of terrigenous organic carbon (OC) in oxic marine environments. A notably increase in the Corg/Ptotal ratio was observed between 455 and 445 Ma, as shown in panels a–e.
