
Keywords: سفر ایزوتوپ کربن; carbon isotope excursion; CIE; cyclization of branched tetraether; CBT; dichloromethane; DCM; glycerol dialkyl glycerol tetraether; GDGT; mass spectrometer; MS; mean annual temperature; MAT; methylation of branched tetraether; MBT; Paleocene-Eocene Ther