Open Research
The data supplement to this work is accessible at https://public.yoda.uu.nl/geo/UU01/I32Z95.html, DOI: 10.24416/UU01-I32Z95. The geological map of Iceland was created using ArcGIS 10.8.1 and data at the Iceland GeoSurvey (Hjartarson & Sæmundsson, 2014), available at (https://en.isor.is/geological-maps-geological-web-map) and (https://arcgisserver.isor.is/). Figures were created with Prism software available athttps://www.graphpad.com/scientific-software/prism/, and Krona (Ondov et al., 2011), available athttps://github.com/marbl/Krona/releases. The raw DNA sequences were processed with the R package DADA2 (version 1.18.0) (Callahan, McMurdie, et al., 2016). DNA sequencing data was obtained using the Silva_132 database (Quast et al., 2013), available at https://www.arb-silva.de/, and the RDP naïve Bayesian classifier (Wang et al., 2007).