Resumen
Fossil wood from Quebrada del Pobre Formation (Sinemurian) was found northeast of La Ligua (71°13'W-32°24'S), V Region, Chile. The anatomical study allowed to determine two new species: Agathoxylon liguaensis sp. nov. and Baieroxylon chilense sp. nov. Baieroxylon, belonging to the Ginkgoales, is described for the first time on the continent and increases to six the number of morphogenera recognized in the Jurassic of South America. The wide annual rings of the taxons studied show that the plants grew under very favorable environmental conditions, in a warm paleoclimate with low temperature fluctuations.