A two-dimensional Occam model of crustal electrical conductivity is derived based on data from 35 magnetotelluric stations on a profile in Saskatchewan, Canada. The model is discussed in relation to a first order description of the resolution and variance of the model parameters. Prior to the two-dimensional Occam's inversion, the data are analysed with respect to underestimated data errors. The analysis is based on separate D⁺ inversions of the E- and H-polarization responses and a procedure for adjusting the data errors is presented. The main features of the model are the presence of two conductive structures with vertically integrated conductivity exceeding 30,000 S and 100, 000 S respectively. In addition to these main features, some minor conductive structures are inferred.