Proportional abundance of most common Danian molluscs contrasted with their abundances in the Maastrichtian.

<p>The displayed Danian species are those in the upper 90^th percentile of the pooled samples of that time. Their Maastrichtian proportions are plotted alongside. Most of the dominant Danian species are survivors that were rare during the Maastrichtian. The two most abundant Danian offshore species are Patagonian endemics that newly originated in the early Danian.