Attached biofilms on rock cuttings of well Paran 20
DNA was extracted using the DNeasy  PowerSoil DNA Isolation Kit (Qiagen) following the manufacturer's protocol. Library preparation using the NEBNext Ultra IIDNA Library Prep Kit (Cat. No. E7645) and sequencing were performed at the Novogene AIT Genomics facility in Singapore. The nine DNA samples were sequenced using 150 bp paired-end reads on the NovaSeq 6000 platform, with a read depth of ~15 Gbp per sample.