Field investigations in North Victoria Land, Antarctica during GANOVEX IX (2005/2006) allow the
revision of the Triassic-Jurassic stratigraphy of ~300 m thick continental deposits in between the crystalline basement
and the Kirkpatrick lava flows of the Ferrar Group. The lower stratigraphic unit (Section Peak Formation) is
characterised by braided river-type quartzose sandstone deposits with intercalations of shale and coal occurring at the
top. It is overlain by a homogeneous unit of reworked tuffs composed of fine-grained silicic shards, quartz and feldspar
(new name: "Shafer Peak Formation"). These deposits can be correlated with parts of the Hanson Formation in the
Central Transantarctic Mountains and require a distal yet unknown source of massive silicic volcanism. Clastic products
of mafic volcanic eruptions, formerly described as a separate stratigraphic formation (Exposure Hill Formation), occur
within local diatreme structures as well as intercalated at various stratigraphic levels within the sedimentary succession.
These dominantly hydroclastic eruptions are the first subaerial expression of Ferrar magmatism. The initial Kirkpatrick
lavas/pillow lavas were generated from local eruptive centres and again may be overlain by thin sediments, which are
covered by the thick plateau lava succession known throughout the Transantarctic Mountain Range.
Additional publication details
USGS Numbered Series
Triassic-Jurassic sediments and multiple volcanic events in North Victoria Land, Antarctica: A revised stratigraphic model