ᎠᏕᎸ ᏓᎶᏂᎨ ᎭᏫᎾᏗᏢ ᏧᏩᏓᏔᏅᏒ ᏥᏄᏍᏛᎩ ᏗᎦᏃᏢᎩ ᏩᎾᎯᎨᏍᏙᏗ ᎣᏤᎵ ᎢᎬᏁᎯ geologically; ᏱᏂᎬᏛᎾ, 75% ᏂᎦᏛ ᎠᏕᎸ ᏓᎶᏂᎨ ᎢᏳᏊ ᎠᏛᎯᏍᏔᏅ ᎤᎭ ᏭᏪᏙᎢ ᎠᎲᏏᏓᏍᏗ ᎣᏂ ᏧᏩᎫᏛ 1910. ᎾᏍᎩ ᎤᎭ ᏭᏪᏙᎢ ᎠᎦᏎᏍᏔᏅ Ꮎ ᏂᎦᏛ ᎯᎠ ᎠᏕᎸ ᏓᎶᏂᎨ ᎭᏫᎾᏗᏢ ᎯᎠ ᎡᎶᎯ Ꮎ ᎤᎭ ᎢᏳᏊ ᏭᏪᏙᎢ ᏗᎧᏃᏗ ᏯᏓᎢᏗᏏ ᎤᏙᏢᏒ ᏏᏴᏫ ᏦᎢ 20 m (66 ft) ᎠᏍᏆᎨᏂ (8000 m³).