Fossil-wood carbon-isotope stratigraphy of the non-marine Wealden group (Lower cretaceous, southern england) by Robinson, SA, Hesselbo, S

“…The new carbon-isotope curve is in smooth continuity with data previously published from the overlying lagoonal Vectis Formation and marine Lower Greensand Group of Aptian age. A tentative correlation with a Tethyan reference carbon-isotope curve allows the provisional application of stage-level chronostratigraphy to the Wealden Group. …”

Mid-Cretaceous pCO(2) based on stomata of the extinct conifer Pseudofrenelopsis (Cheirolepidiaceae) by Haworth, M, Hesselbo, S, McElwain, J, Robinson, SA, Brunt, J

“…Samples are from nonmarine to marine strata of the Wealden and Lower Greensand Groups of England and the Potomac Group of the eastern United States, of Hauterivian to Albian age (136-100 Ma). …”