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. 2020 Aug 5;15(8):e0235421. doi: 10.1371/journal.pone.0235421

Fig 1. Chemical composition of the rock varnish on the lava flows at Aberdeen, CA.

Fig 1

(a) Elemental composition expressed as enrichment factors vs. average upper continental crust. (b) Rare earth element and yttrium enrichment factors vs. carbonaceous chondrite C1 composition. The black line represents the average of our previous data from Type I varnish; the color bars show the range of our previous measurements, with the darker color indicating the interquartile range. (RE stands for the sum of rare earth elements and yttrium).