Upper Ordovician microphytoplankton of the Bill's Creek Shale and Stonington Formation, Upper Peninsula of Michigan, U.S.A.: Biostratigraphy and paleogeographic significance
Keywords: جغرافیای دیرینه، دیرینجغرافیا، پالئوژئوگرافی; Acritarchs; Bill's Creek Shale; Biostratigraphy; Paleoenvironment; Paleogeography; Stonington Formation; Upper Ordovician; Acritarches; Shale de Bill's Creek; Biostratigraphie; Paléoenvironnement; Paléogéographie; Formation de Stonington; Ordovicien Su