One of the subglacial domes of Ember Ridge, in the Mount Cayley volcanic field. Ember Ridge consists of six irregular masses of aphanitic to glassy hornblende-phyric andesite. This mass has a colloform surface, which is locally broken down into small ridges and spires. Jointing is fine-scale and complex; columns average 15-25 cm in diameter, with the finest jointing near the top of the dome. Older crystalline basement covered in glacial debris fills the right foreground.