One subdivision of this period is denoted by the appearance of Neodiversograptus nilssoni and is split into the Gorstian and Ludfordian stages.
One subdivision of this period is denoted by the appearance of Neodiversograptus nilssoni and is split into the Gorstian and Ludfordian stages. The appearance of graptolites distinguishes the four epochs of this period, which include the aforementioned Ludlow epoch. This period saw the emergence of a genus that produced sporangia at their tips, called Cooksonia, the first vascular land plants. It was preceded by the third largest extinction event in Earth's history, which resulted in sea scorpions being the dominant aquatic predator. This period saw the first appearance of coral reefs, the first jawed fish and the first freshwater fish. For 10 points, name this third period of the Paleozoic era that saw the closing of the Iapetus Ocean and was followed by the Devonian.
One subdivision of this period is denoted by the appearance of Neodiversograptus nilssoni and is split into the Gorstian and Ludfordian stages.
Silurian period [prompt on \"Paleozoic\" before mentioned]