TY - CPAPER TI - Trend surface analysis of thickness data of the Chaco-Mesopotamian Basin, Argentina PY - 1972 AU - Amaral, Gilberto AU - Rocha-Campos, A. C. T2 - International Symposium on the Carboniferous and Permian Systems in South America J2 - Abstracts PP - São Paulo PB - IGc/USP SP - 6-7 ER -