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- W2015366925 abstract "Abstract Early Silurian cherts from the Holy Cross and Bardzkie Mountains (Poland) contain abundant microfossils morphologically resembling contemporary cyanobacteria. Most of the organic matter preserved in the cherts is highly mature and extensively degraded because of biological decomposition and progressive thermal alteration. These processes may have changed the original morphology of the deposited microbial remains, so the microfossil origin could be easily misinterpreted. The cherts were therefore examined using organic geochemical and stable isotope techniques to provide support for the presence of cyanobacterial remains. The nitrogen isotopic composition of bulk sediments and extractable organic matter ranged from +0.1‰ to −2.2‰ and from +1.8‰ to −1.7‰, respectively. The δ 15 N values are thus in good agreement with a contribution of diazotrophic cyanobacteria for both locations. Biomarkers in the Holy Cross Mts. cherts included mid-chain branched monomethyl alkanes, indicative of a cyanobacterial contribution. However, molecular fossils of a cyanobacterial origin were not detected in the Bardzkie Mts. cherts, most likely because of the greater maturity than those from the Holy Cross Mts." @default.
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- W2015366925 date "2009-02-01" @default.
- W2015366925 modified "2023-09-27" @default.
- W2015366925 title "A biomarker and δ15N study of thermally altered Silurian cyanobacterial mats" @default.
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- W2015366925 doi "https://doi.org/10.1016/j.orggeochem.2008.11.008" @default.
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