The Flourmill Centre lies at the headwaters of Flourmill Creek and is the most southerly of the two Flourmill Volcanoes. It has an elevation of and rises above its base. Three overlapping cinder cones of slightly differing ages comprise the Flourmill Centre. The oldest cone lies on the northeastern side and is only partially preserved, with the southeastern side having been destroyed or buried by ejecta from subsequent eruptions. It consists of irregular volcanic blocks and rare bipolar fusiform bombs interlayered with vesicular agglutinate. A breach on the southeast side of the cone drained a central lava lake. The lava flowed southwest into the Spanish Creek valley, carrying rafts of agglutinate from the wall of the cone.