Molluscs and arthropods originated during this period, which preceded the Ordovician.
The Kaili biota formed during the fifth stage of this time period, and one group of fossilized remains from this time period is the Orsten fauna, notable for its well preserved, soft-body remains. It saw the extinction of Ediacaran organisms and is marked by the evolution of Treptichnus pedum. This period is known for its abundance of lagerstatte, featured in the Canadian (*) Burgess Shale formation, and the first appearance of trilobites. Molluscs and arthropods originated during this period, which preceded the Ordovician. For ten points, name this geological period, the first of Paleozoic Era, that featured a namesake "explosion."
The Kaili biota formed during the fifth stage of this time period, and one group of fossilized remains from this time period is the Orsten fauna, notable for its well preserved, soft-body remains.
Cambrian Period