Table 2.

Summary of pairwise tests of correlation over the Jurassic–Cretaceous interval

Fossiliferous marine formations (sampling) N=23 (19)Non-marine area N=23 (19)Sea-level (Haq et al. 1987) N=23 (19)Sea-level (Miller et al. 2005) N=18 (16)
‘Raw’ data comparisons
Taxic diversity (log10 transformed)Shallow marine0.366ns−0.706**0.503*0.543*
Open ocean0.513** (0.735**)−0.261ns (−0.458*)0.380ns (0.655**)0.709** (0.804**)
Total0.574** (0.733**)−0.480* (−0.626**)0.462* (0.654**)0.739** (0.819 **)
Shallow marine area proxySea-level
(Haq et al. 1987)0.631**−0.852**
(Miller et al. 2005)0.568*−0.825**
Non-marine area (Smith et al. 1994)−0.609**
Generalized differenced (or detrended) data comparisons
Taxic diversityShallow marine0.220ns−0.545**−0.160ns0.570*
Open ocean0.449* (0.721**)−0.0467ns (0.164ns)−0.0359ns (−0.0319ns)0.409ns (0.388ns)
Total0.369ns (0.499*)−0.338ns (−0.256ns)−0.125ns (−0.132ns)0.546* (0.514*)
Shallow marine area proxySea-level
(Haq et al. 1987)−0.0964ns0.113ns
(Miller et al. 2005)0.167ns−0.335ns
Non-marine area (Smith et al. 1994)0.160ns
  • Correlation coefficients are derived from Pearson's product moment (r), suffixed byns, non-significant; *significant at α=0.05; **, significant at α=0.0125 (i.e. incorporating a correction for multiple comparisons). Results in brackets were calculated excluding Lagerstätten stages. Shaded cells contain results that were significant after correction for multiple comparisons.