For each taxon, a description, sources of alternative descriptions, details of size and stratigraphical range are given, compiled from the literature sources listed in the reference section and the personal records of the authors.
The descriptions present features in a common format and, as far as practical, to a common standard. They are based on original descriptions and emendations, as well as on the specimens in the collection. Original descriptions and emendations vary considerably in detail, completeness, terminology and the style and order of presentation of features. Alternative descriptions are listed; these may include the authorâ€™s diagnosis or other subsequent descriptions. Descriptive terminology follows Punt et al. (1994). Stratigraphical assignments and ages given on the data sheets are taken from the original literature sources or the personal records of the authors. Records are from material of known origin (borehole core or cuttings or outcrop samples) or unknown origin.
The chronostratigraphy used includes a global stage interpretation with regional substages shown in square brackets. The regional substages represent a finer resolution, and a closer approximation to the biozonal data included in this report. In many cases the global stages have not yet been formally defined and when they are, conodonts are likely to be the biozonal indices, so there is still some uncertainty about how the miospore biozones will equate with the global stages. Until further information becomes available, the authors are following the guidance published by Heckel and Clayton (2006) which provides a simplified equivalence of regional and global stratigraphy.
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