La Matilde Formation

La Matilde consists primarily of sedimentary rocks. It includes claystone, coal beds, conglomerates, siltstones, sandstones, and volcanic tuff. La Matilde overlies but sometimes intersperses with the Middle Jurassic Chon Aike Formation. The two formations are the subunits of the Bahía Laura Group. == Fossil content ==

La Matilde is known for the abundant fossils recovered from it. Notable fossil localities in the formation include the Cerro Cuadrado Petrified Forest, the Cerro Madre e Hija Petrified Forest, and the remains and trace fossils (including trackways) of dinosaurs in the Laguna Manantiales Farm. Fossil taxa recovered from the La Matilde Formation include: ;Flora • Agathoxylon matildense • Araucaria mirabilis • Araucarites sanctaecrucis • Brachyphyllum • Equisetum thermale • Hermatomycesporites patagonicus • Pararaucaria patagonica ;Ichnofossils • Ameghinichnus patagonicus • Casamiquelichnus navesorum • Delatorrichnus goyenechei • Wildeichnus navesi == See also ==