Stable isotope compositions of recent and fossil sun/shade leaves and implications for palaeoenvironmental reconstruction

► Stable isotope values are notably different between modern sun and shade leaves. ► Isotope compositions don't present a difference between fossil sun and shade leaves. ► Anatomic features are better indicators in distinguishing fossil sun/shade leaves. ► Sun leaves may be more sensitive in response to past environmental changes. ► δ13C of sun morphotype is better proxy in reconstructing palaeoenvironments.