Fig. 2: Spatiotemporal distribution of mafic igneous rock samples.
From: Reconstructing Earth’s atmospheric oxygenation history using machine learning
a Spatial distribution of global data compilation of whole rock mafic igneous compositions from the EarthChem, GEOROC, and USGS data repositories. The map was created with ArcGIS 10.8. b Histogram of age-frequency distribution of mafic igneous rock samples (age bin = 100 Myr).
