Radley is correct that the changing facies and palaeoenvironments of the Triassic-Jurassic rock record of the SW UK do complicate matters, but if a key control on fossil diversity in this interval is the biotic consequences of a major extinction event then certainly the lowdiversity benthic assemblages of the Lilstock Formation do not necessarily have to reflect changes in salinity as previously suggested. Notwithstanding the facts that this is standard practice when displaying discrete numerical data, such as isotope values (e.g. Hesselbo et al. 2004), against stratigraphic sections, and that neither reviewers nor the Editor found this in any way misleading, the reason we did this was simply to reinforce the fact that the siliciclastic and carbonate samples were treated separately so as to avoid the pitfall of comparing mudstone with limestone.
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