For 10 points, name this geologic periodnamed for the Latin name of Wales.
Fossils from this period come from the laggerstatten of Sirius Passet and Chengjiang, and theTreptichnus pedum assemblage of trace fossils is used to define its base. The breakup of Pannotiabegan at its start. Archeocyathids are index fossils for this period, which features the first knowncrustacean fossils. Many of the most important fossils from this period were found in the (*) Burgessshale. This period is the first of the Paleozoic and is followed by the Ordovician. Trilobites make theirdebut in the fossils of this period. The time period before it is simply dubbed "pre-" this, and it featured alarge boom in diversity of Earth's fauna, its namesake explosion. For 10 points, name this geologic periodnamed for the Latin name of Wales.
Fossils from this period come from the laggerstatten of Sirius Passet and Chengjiang, and theTreptichnus pedum assemblage of trace fossils is used to define its base.
Cambrian period