Figures 5.7A-D Historical distributions of publication of the earliest stratigraphic records for fossil
families (diamonds). Data from Benton (1993) plotted at 25-year intervals and compared with the
palaeontological effort curve (squares). Almost invariably fossil groups have curves to the left of the
effort curve, suggesting that they are better known than would be expected from random
discovery. See text for further explanation.
GHOST RANGES 103