Description: This data set contains values on the cheilanthane (tricyclic terpenoids) ratios of C22/C21 and C24/23 from Mesoproterozoic to Silurian rocks of global distribution. Lipid extractions were performed following standard protocols. The yield was contamination-controlled via exterior vs. interior comparison of individual peak concentrations. Values were obtained via integration of multiple-reaction-monitoring (MRM) measurements. In comparing our data of cheilanthane ratios to that reported for younger rocks and oils, we noticed consistently lower C24/C23 values in our samples, suggesting a bimodal character of cheilanthane distribution in time. We tentatively attribute this to the rise of a source of oxidatively decarboxylated cheilanthatriol derived from ferns. Fossil cheilanthanes likely represent a composite mixture of various biological sources, whose secular patterns may record more than the Paleozoic rise of terrestrial plants presented here.
Global identifier:
Doi(
"10.1594/PANGAEA.932811",
)
Measurements {
domain: Unspecified,
station: None,
measured_variables: [
"Event label",
"Cheilanthane, C22/C21 ratio",
"Cheilanthane, C24/C23 ratio",
"Laboratory code/label",
"Geologic age name",
"Outcrop ID",
"SECTION, height",
"Formation",
],
methods: [],
}
Dataset
Origins: /Wissenschaft/PANGAEA
Tags: Biomarker ? Farn ? Landpflanze ? Daten ? Innenraum ? Early Paleozoic ? cheilanthane ? tricyclic terpenoids ?
Bounding boxes: 14.31° .. 140.6323° x -34.8° .. 58.33°
License: cc-by/4.0
Data access requires registration: click here for further informationLanguage: Englisch/English
Modified: 2025-01-09
Time ranges: 2025-01-09 - 2025-01-09
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