For anyone wondering:

• 538 mya: cambrian explosion
• 419 mya: sharks
• 385 mya: tree ferns, horsetail trees & co. (also, Ginkgo)
• 245 mya: conifers (lignin)
• 230 mya: lignin decomposing
• 130 mya: flowering plants
• 65 mya: forests covering the globe
• 1.5 mya to recently: four glacial periods