Cambrian series 3 (Drumian) trilobites from limestone olistoliths, Reilly Ridge, Northern Victoria land, Antarctica

Cambrian Series 3 (Drumian) trilobites are described from twelve limestone olistoliths within a mudstone succession at Reilly Ridge, Northern Victoria Land, Antarctica. The olistoliths are interpreted to occur within a debris flow deposit. Most of the olistoliths were deposited originally under shallow water, high energy conditions, although one was deposited in an outer shelf setting. The individual olistoliths from the shallow water settings show considerable variation in faunal content, suggesting that they came from slightly different depositional environments. They may be of slightly different ages, within the range of the 'Ptychagnostus atavus' Zone to the 'Goniagnostus nathorsti' Zone, and probably at the lower end of this range. A shale, about 50 m above the olistoliths, contains the agnostoid 'Lejopyge armata'. Two new genera, 'Liopeishaniella' and 'Vicnepea', are erected.