Abstract
Abstract In the Mt Somers area, a transgressive sequence of Upper Cretaceous to lower Tertiary sediments (Broken River Formation) was deposited on a basement of Mesozoic siliciclastic sediments (Torlesse Supergroup) and mid-Cretaceous calcalkaline volcanics (Mt Somers Volcanics Group). As a result of late Tertiary block faulting (Kaikoura Orogeny) and erosion, the sequence is preserved only in small, disconnected outliers. In the study area, lower Tertiary sediments overlie kaolinised rhyolites and ignimbrites of the Somers Rhyolite (a formation of the Mt Somers Volcanics Group). A composite lithostratigraphic sequence was constructed from five separate localities, and, although some correlations are uncertain, it is supported by palynological data. The transgressive sequence starts with terrestrial coal measures, which locally include subaerial volcanic—pebbly sediment gravity-flow deposits, followed by several units of intertidal to subtidal clays, sands, and gravels. These show a variety of physical an...
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