The Beacon Supergroup is a geological formation exposed in Antarctica and deposited from the Devonian to the Triassic (400 to 250 million years ago).

[2][3] Generally flat lying, the supergroup is up to 3.2 km thick and is fairly continuous from south Victoria Land to the Beardmore Glacier along the Transantarctic Mountains.

[4][5][6][7][8][9] The location of the formation in a cold, desert environment and the lack of nutrients or soil (due to the purity of the sandstone) has led to the Beacon Sandstone being considered the closest analogue on Earth to Martian conditions; therefore, many studies have been performed on life's survival there, mainly focusing on the lichen communities that form the modern inhabitants.

[18][8][9] The Beacon Heights Orthoquartzite (330 m) is found in the South Victoria Land region between the Arena Sandstone and the overlying Devonian Aztec Siltstone.

The siltstone includes interbedded sandstones, fish-bearing shales, conchostracans, and paleosols implying subaerial periods[17] within an alluvial plain sequence.

[15][19][8][9] Within the Beardmore Glacier region, the Devonian Alexandra Formation (0–320 m), which constitutes the entire Taylor Group, is a quartz sandstone to siltstone.

The Pyramid Erosion Surface separates the Mitschell Tillite and the Weller Coal Measures, which are overlain by the Feather Conglomerate (215 m) and the Triassic Lashly Formation (520 m).

[18] The wood bears clear growth rings, indicating a seasonal environment, and is large enough to represent a temperate climate, though glacial just before Beacon deposition.

They change from Skolithos-dominated facies to wide diversity and abundance, including vertical and horizontal burrows and huge arthropod trackways.