Erosional remnants of lava flows from Maitland Volcano are present as scattered, cliff-bounded cappings on higher mountains of the Klappan Range. These flat-lying lava caps are up to thick and contain as much as 20 separate lava flow units, each commonly thick. Aphyric to slightly feldspar-phyric basalt is the primary volcanic rock, although greenish-grey trachybasalt and pale green trachyte form the uppermost flows of thick sections. The highest remnant of Maitland Volcano has an elevation of .