Heat-flow data in western Victoria

New heat-flow data have been obtained in western Victoria at Horsham (89.8 +/- 7.3 mW m(-2)) and Warracknabeal (97.0 +/- 8.7 mW m(-2)). The results are significantly less than previous values obtained at Stawell and Castlemaine and consequently crustal models based on rapid cooling of high-level melt emplacements require revision. More general models based on mid-crustal detachments or underplating mechanisms do not require the preservation of a specific spatial anomaly and consequently remain unaffected. Previous inconsistencies between surface heat flow and surface heat production are eliminated if the new data are substituted for the previous Stawell and Castlemaine data.