disconformity called the Maya Erosion Surface. Taylor Group formations in the Darwin Mountains region include the Brown Hills Conglomerate (34 m), which overlies pre-Devonian plutonic rocks of igneous and metamorphic nature, with over 30 m of erosional relief, and igneous and metamorphic clasts. The conglomerate is poorly sorted at the base, with influxes of coarser material. Coarseness is laterally variable, with pebbles in places and sands in others at the same horizon. The conglomerate includes planar beds, trough cross-bedding, flaser bedding, mud-drapes on some ripples, U-shaped burrows and escape structures, with fining-up cycles topped by desiccation cracks in places. The depositional environment is probably that of an alluvial fan, though unidirectional flow and sheet-like deposition point to braided channels. Equivalent strata in South Victoria Land include the Wind Gully Sandstone (80 m), the Terra Cotta Siltstone (82 m), and the New Mountain Sandstone (250 m), which are separated from the overlying Altar Mountain Formation (235 m) and Arena Sandstone (385 m) by a disconformity. Within the Darwin Mountains region, the Junction Sandstone (290 m) overlies the Brown Hills Conglomerate, with abundant Skolithos. This is followed by the Hatherton Sandstone (330 m), with brachiopod and bivalve shell fragments in places. Trough cross beds and current rippling are present, with abundant ichnofauna. Drainage was to the north east, with the depositional environment presumed to be marine, though also present are subaerial features such as desiccation cracks, rain drop impressions, surface run-off channels, muddy veneers, and redbeds, besides river-like features such as small channels. The Beacon Heights Orthoquartzite (330 m) is found in the South Victoria Land region between the Arena Sandstone and the overlying Devonian Aztec Siltstone. It is well sorted and cemented, with medium to coarse grain sizes and trough cross-beds, with Haplostigma and Beaconites remnants. The Aztec Siltstone (125–220 m) is found both in South Victoria Land and the Darwin Mountains. The siltstone includes interbedded sandstones, fish-bearing shales, conchostracans, and paleosols implying subaerial periods within an alluvial plain sequence. Within the Beardmore Glacier region, the Devonian Alexandra Formation (0–320 m), which constitutes the entire Taylor Group, is a quartz sandstone to siltstone. Victoria Group The Victoria Group begins with a diamictite-bearing unit known as the Metschel Tillite (0–70 m) in South Victoria Land and continues with the Darwin Tillite (82 m) in the Darwin Mountains, the Pagoda Tillite (395 m) at the Beardmore Glacier, the Scott Glacier Formation (93 m)