TY  - RPRT
TI  - Biomarkers in the Precambrian: Earth’s ancient sedimentary record of life
AU  - Christian Hallmann
AU  - Katherine L. French
AU  - Jochen J. Brocks
PY  - 2022
DO  - 10.2138/gselements.18.2.93
UR  - https://pubs.usgs.gov/publication/70238573
ID  - 70238573
ER  -