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Milestone Bluff Formation

Description

Bedded sedimentary, volcaniclastic and volcanic rocks exposed in the escarpments of south central Adelaide Island at Fletcher Bluff, Milestone Bluff, Window Buttress to Cape Alexandra. Dominated by cobble/boulder conglomerates and sandstones composed of immature volcanic material. Interbedded with rare crystal, crystal-lithic and vitric tuffs. Belemnite, bivalve and plants fossil fragments have been located at Milestone Bluff and Window Buttress. An interbedded silicic crystal tuff has yielded an age of 113.9 ± 2.5 Ma (Riley et al., 2012)1.

Age

Early Cretaceous (113.9 ±2.5 Ma)

Map Reference

Riley, T. R., Flowerdew, M. J. & Haselwimmer, C. E. Geological Map of Adelaide Island, Graham Land (1:200 000 scale). Sheet 2, (British Antarctic Survey, 2011). Available here.

References

  1. Riley, T. R., Flowerdew, M. J. & Whitehouse, M. J. Chrono-and lithostratigraphy of a Mesozoic–Tertiary fore-to intra-arc basin: Adelaide Island, Antarctic Peninsula. Geol. Mag. 149, 768–782 (2012). ↩