Geochemical Evidence of First Forestation in the Southernmost Euramerica from Upper Devonian (Famennian) Black Shales.

Sci Rep · 2019 · PMC6527553 · PMID 31110279

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an increasing trendP = 0.001actually significant

This pattern is in agreement with the XRF data that show an increasing trend in the ratios of SiO 2 to Al 2 O 3 , from 5.1 ± 1.1 in the lower unit to 7.2 ± 1.3 in the upper unit (Mann-Whitney U test: P = 0.001) (Fig. 4 ).

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