Figure: A graph showing the biodiversity of trilobite genera in the late Silurian Period and the entire Devonian Period. The x-axis represents time, running from the Ludfordian Epoch to the end of the Devonian Period. The y-axis represents the number of genera, running from 0 to 60. Four lines are plotted on the graph: one for shareholder quorum sampling for 70 samples, one for sampled in bin index, one for range-through diversity, and one for boundary-crosser diversity. Each of the four plots show that the population of trilobites in this area started at nearly none at the end of the Silurian, but then exploded during the first few epochs of the Devonian before crashing back down near zero once again in the mid to late Devonian.

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