The Exposure Hill Formation, Mesa Range
- Edmund Stump
Published Online: 16 MAR 2013
Copyright 1986 by the American Geophysical Union.
Geological Investigations in Northern Victoria Land
How to Cite
Elliot, D. H., Haban, M. A. and Siders, M. A. (1986) The Exposure Hill Formation, Mesa Range, in Geological Investigations in Northern Victoria Land (ed E. Stump), American Geophysical Union, Washington, D. C.. doi: 10.1002/9781118664957.ch12
- Published Online: 16 MAR 2013
- Published Print: 1 JAN 1986
Print ISBN: 9780875901978
Online ISBN: 9781118664957
- Geology—Antarctic regions—Victoria Land
A sequence of pyroclastic rocks crops out below the Jurassic Kirkpatrick Basalt and above the Triassic Section Peak Formation in the Mesa Range region. These rocks include breccia, lapilli tuff, tuff, and tuffaceous sandstone. Compositionally, the coarser clasts are dominated by those of basaltic composition, although megaclasts of sandstone from the Section Peak Formation are locally conspicuous. Finer clasts that form the tuffs and the matrix of breccias and lapilli tuffs include basaltic ash and pyroxene grains as well as a silicic component derived from the Section Peak Formation. Characteristics of the basaltic component suggest that hydroclastic processes operated during formation of these rocks. This sequence of pyroclastic rock represents an early phase of the tholeiitic magmatism of the Ferrar Group.