Fig. 2 in A new fossil provannid gastropod from Miocene hydrocarbon seep deposits, East Coast Basin, North Island, New Zealand

Fig. 2. Generalised stratigraphy of the East Coast Basin, showing the Miocene−age seep carbonates that occur as isolated lenses within the mudstones of the Tolaga Group. The organic−rich, underlying Waipawa Black Shale is thought to be one of the likely source rocks. Abbreviations: Bx, Bexhaven Limestone; Ih, Ihungia Limestone; To, Tolaga Group; Wb, Weber Formation; Wn, Wanstead Formation; Wp, Waipawa Black Shale. Figure modified from Campbell et al. (2008).