For constant pressure towed measurements a simple temperature/salinity (T/S) technique separates effects of vertical stratification from those of along-isopycnal variations of water properties indicative of interleaving. This technique is used to examine th occurrence of temerature microstructure and T/S fine structure in relations to a mesoscale feature which may be part of a frontal region between coastal and oceanic waters in the northeastern Pacific. The temperature microstructure seems to be concentrated at the boundaries, both vertical and lateral, of intrusive features which presumably have their origin in the larger mesoscale field. The association of temperature microstructure with lateral variation of water roperties in frontlike structures implies problems with the Osborn-Cox model normally used to estimate vertical heat fluxes from measurements of the temperaure microscale.