An Early-Middle Ordovician acritarch and prasinophyte assemblage from Houping, Chongqing city, South China: Biostratigraphical and palaeoenvironmental implications

► We record an acritarch and prasinophyte assemblage from the Houping section. ► 41 species attributed to 25 genera of acritarch and prasinophyte are described. ► The stratigraphical implications of several acritarch taxa are discussed. ► The acritarch ecological implications are discussed by quantitative analysis.