DETERMINACION XILOLOGICA DE UNA RAIZ PETRIFICADA DE PROTEACEAE DE LA FORMACION RIO TURBIO (EOCENO), SANTA CRUZ, ARGENTINA
AbstractThe xylem structure of a possible silicified fossil root from the Río Turbio Formation, Santa Cruz Province, was studied. Stratigraphic data suggest that the plant bearing bed is Eocenein age. The xylem has two ray types: broad and 1-2 seriate. Vessels are disposed in tangencial series and the paratracheal parenchyma is scarce. The structure and composition of the wall of all xyleme elements were modified during fossilization. The marerilal was analysed with U.V., P.L. and microchemical reactives. The absence of central medulla and the presence of fragmentary primary xylem instead suggest that the fossil is a root and not a stem.
How to Cite
Authors publishing in Ameghiniana have the option of making their article freely available online. Authors opting for the Open Access must pay a fee of $300 (US dollars) to cover article-processing costs and to ensure the article is made open access. Please contact the Production Team after the acceptance of your manuscript if you are interested in making your article Open Access. This option implies by default a license Creative Commons Attribution Non-Commercial-NoDerivs License (CC BY NC ND). If your funding institution requires a different licensing option please communicate this to the Production Team after the acceptance of your manusctipt.