Figure 5. Principal components analysis scatterplot with 90% confidence ellipses of sample mean. Wire frames (shape scale factor −0.1 to 0.1) showing shape change along PC axis.
Comparing Ludlowville and Moscow formation specimens, on the other hand, does not yield significant results (p=0.15, Table 2). The only other significant difference can be found in comparison of Skaneateles and Moscow material PC 4 values (p=0.03, Table 2).
Specimens collected in silt and fine silt facies develop
similar morphological shell disks (Fig. 5.2); this is supported by the pairwise comparison of the PC 1 through PC 4, showing no significant differences among specimens from these substrates (Table 3), whereas specimens from the muddy facies are
