RECOGNITION OF HIGH-RESOLUTION PALYNOLOGI CAL CYCLES IN THE DOGGER FROM BURGUNDY

More than 400 Jurassic samples (Aalenian to Oxfordian), from 34 outcro ps and drill holes in Burgundy, have been palynologically analysed. Th is study indicates the occurrence of cycles characterized by alternati ons between sapropelic and humic palynofacies directly related on the one hand to alternations between dinocysts or spores and pollen and on the other to acritarchs. Such alternations have probably been observe d at different scales from second or third order sequences to the thin nest parasequences (4th to 6th order). Two outcrops and one drill hole have been chosen to illustrate the usefulness of such alternations. A lternations in second and third order sequences are useful for correla tion from a distance whereas alternations in parasequences indicate a palynological cyclicity of very high resolution.