Resumen de Paleozoic Microphytoplankton from South America
Thirty-three cutting samples from a well in Bolivia yielded a diverse and well-preserved organic-walled microphytoplankton assemblage. Thirty-eight species of acritarchs were encountered. Lithologically, the studied samples are siltstones, silty shales, black shales and limy shales with brachiopods and trilobites. The most abundant forms are Veryhachium, Exochoderma, Diexallophasis, Multiplicisphaeridium, Muraticavea, Onondagella, and Tasmanites. Several species are considered to be new but not described. Four biostratigraphic assemblage zones are suggested. The age is considered to be Late Silurian to Middle Devonian.
