For anyone wondering (numbers in million years ago (mya))

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