Fig. 6
From: The impact of the Pliensbachian–Toarcian crisis on belemnite assemblages and size distribution
PCA biplot plotting the median size changes between assemblages attributable to zones and their components (assemblage: size changes seen within entire assemblage; lineage: size changes within lineages crossing the boundary; appearance: size changes drive by specimens appearing; disappearance: size changes driven by specimens appearing). Observations are grouped based on the transition from Spinatum–Tenuicostatum Zone (Pli-Toa crisis), Tenuicostatum–Serpentinum Zone or Serpentinum–Bifrons Zone (T-OAE) and all others (background)