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Paleozoic–Mesozoic terrestrial total organic carbon and organic carbon isotope database
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DOI：10.5194/essd-18-4475-2026.png)
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Abstract
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Abstract. Studies of the terrestrial carbon cycle commonly rely on geochemical proxies such as total organic carbon (TOC) and the organic carbon isotopic composition (δ13Corg). However; terrestrial TOC and δ13Corg data are widely dispersed across the literature and lack a unified compilation; limiting large-scale synthesis and cross-comparison. Here; we present a global; standardized dataset of TOC and δ13Corg measurements derived primarily from terrestrial sedimentary facies: Paleozoic–Mesozoic Terrestrial Total Organic Carbon and Organic Carbon Isotope Database (PM-TOCI). The dataset compiles 66 583 individual data points (49 014 TOC and 17 569 δ13Corg) from 619 publications; spanning the Devonian to Cretaceous (419–66 Ma). Each entry is accompanied by 37 standardized metadata fields; covering geographic information; stratigraphic age; lithology; and depositional facies; thereby enabling consistent filtering; comparison; and reuse across spatial and temporal scales. This dataset is intended to facilitate future data-driven studies of terrestrial organic carbon accumulation; paleoclimate variability; source rock assessment; and long-term carbon cycle dynamics; as well as the link between carbon cycle and biotic evolution. The dataset is openly accessible at https://doi.org/10.5281/zenodo.20486580 (Tian et al.; 2026).
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