When Exxon unveiled their version of sequence stratigraphy to the wider geological community in the late 1980s, their methodologies and models became the object of much careful scrutiny and heated argument. One of the more fruitful debates has surrounded an issue that was omitted from the original ‘slug’ model and its variants (for example, as portrayed in Van Wagoner et al., AAPG Methods in Exploration no. 7, 1990), which implied that periods of relative sea-level fall are represented by non-deposition, particularly in the shallow marine realm. Recent work suggests that shallow marine deposition is common at such times, and...

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