Gymnosperms have been around since the Meszonic era. The first evolution of seeded vascular plants came in the Paleozoic era, as there were lots of changes in the Mesozoic that made this their era. The dominant species of gymnosperms during this time were the Ginkgo and the Cycads. Now a days, they are our familiar evergreen trees and shrubs!
Ginkgo:
Ginkgo:
Cycads:
Evergreens: