Editing Miocene (section)

===Microbiota===
Microbial life in the igneous crust of the [[Fennoscandian Shield]] shifted from being dominated by [[methanogen]]s to being primarily composed of [[sulfate-reducing microorganism|sulphate-reducing prokaryotes]]. The change resulted from fracture reactivation during the Pyrenean-Alpine orogeny, enabling sulphate-reducing microbes to permeate into the Fennoscandian Shield via descending surficial waters.<ref>{{cite journal |last1=Drake |first1=Henrik |last2=Roberts |first2=Nick M. W. |last3=Reinhardt |first3=Manuel |last4=Whitehouse |first4=Martin |last5=Ivarsson |first5=Magnus |last6=Karlsson |first6=Andreas |last7=Kooijman |first7=Ellen |last8=Kielmann-Schmitt |first8=Melanie |date=3 June 2021 |title=Biosignatures of ancient microbial life are present across the igneous crust of the Fennoscandian shield |url=https://www.nature.com/articles/s43247-021-00170-2?error=cookies_not_supported&code=dc672908-be0f-4c99-8663-e442770a53fa |journal=[[Communications Earth & Environment]] |volume=2 |pages=1–13 |doi=10.1038/s43247-021-00170-2 |s2cid=235307116 |access-date=14 January 2023}}</ref>

Diatom diversity was inversely correlated with carbon dioxide levels and global temperatures during the Miocene. Most modern lineages of diatoms appeared by the Late Miocene.<ref>{{cite journal |last1=Lazarus |first1=David |last2=Barron |first2=John |last3=Renaudie |first3=Johan |last4=Diver |first4=Patrick |last5=Türke |first5=Andreas |date=22 January 2014 |title=Cenozoic Planktonic Marine Diatom Diversity and Correlation to Climate Change |journal=[[PLOS ONE]] |volume=9 |issue=1 |pages=e84857 |doi=10.1371/journal.pone.0084857 |pmid=24465441 |pmc=3898954 |bibcode=2014PLoSO...984857L |doi-access=free }}</ref>