Fish‐bearing Aztec Siltstone (Devonian) in the Cook Mountains, Antarctica

Outcrops of Aztec Siltstone (Taylor Group, Beacon Supergroup) have been discovered near MtHughes in the Cook Mountains, southern Victoria Land, Antarctica, over 100 km south of the nearest previously known exposures. The newly found Aztec Siltstonerests confonnably onHathertonSandstone, and has been dated as early Late Devonian (Frasnian) on the presence of phyllolepid placodenn fish.