Extended Data Fig. 7: Biomarker signatures of the Bété I archaeological sediments.
From: Humans in Africa’s wet tropical forests 150 thousand years ago
See Section 4.2.1 for ACL and CPI calculations. Two versions of the submerged/terrestrial ratio were calculated: STR24 and STR24 + 26. Submerged aquatic plants tend to have values greater than 0.25 and 0.50 for STR24 and STR24 + 26, respectively. Two versions of the aquatic plant ratio (Paq) were also calculated to compare with STR. Terrestrial plants typically have sedimentary Paq values of less than 0.1 while aquatic plants tend to have values greater than 0.7. Values ranging between 0.1 and 0.7 typically represent a mixed input that includes terrestrial, emergent, and aquatic plants. The percentages of compound abundances are relative to the dominant FAMEs (C22 + C24 + C26 + C28 + C30). Higher values reflect relatively increased inputs of the respective compounds.
