The Mazatecan variety with the most thoroughly described phonology is that of Jalapa de Díaz, which has been described in two publications by Silverman, Blankenship, Kirk and Ladefoged (1994 and 1995). The description is based on acoustic analysis and contemporary forms of phonological analysis. To give an overview of the phonological variety among Mazatecan languages, it is presented here and compared to the earlier description of Chiquihuitlán Mazatec published by the SIL linguist A. R. Jamieson, in 1977, which is not based on modern acoustic analysis and relies on a much more dated phonological theory and so it should be regarded as a tentative account. One fundamental distinction between the analyses is that Silverman et al. analyze distinctions between aspirated and nasalized consonants, but Jamieson analyzes them as sequences of two or more phonemes, arriving therefore at a much smaller number of consonants.