Comment on: `Magnetostratigraphy and biostratigraphy of the Middle Triassic Margon section (Southern Alps, Italy)' by P.R. Gialanella, F. Heller, P. Mietto, A. Incoronato, V. De Zanche, P. Gianolla, G. Roghi[Earth Planet. Sci. Lett. 187 (2001) 17-25]