		Silurian Period
Paleozoic: Silurian Period		Wenlock

	Llandovery	Ordovician	Silurian
	Ludlow	Devonian	Sheinwoodian	Timescale

The Wenlock

The Wenlock Epoch of the Silurian Period: 428 to 423 Mya

Paleozoic Era
   Cambrian Period
   Ordovician Period
   Silurian Period
      Llandovery Epoch
      Wenlock Epoch
         Sheinwoodian Age
         Homerian Age
      Ludlow Epoch
      Pridoli Epoch
   Devonian Period
   Carboniferous Period
   Permian Period

During the Wenlock the oldest known tracheophytes (true land plants), of the genus Cooksonia, appear. The complexity of slightly younger (Ludlow) Gondwana plants like Barragwanatha indicates either a much longer history for vascular plants, perhaps extending into the early Silurian or even Ordovician, or else a misdating of the Barragwanatha sediments.

Stratigraphy

Epoch	stage	page)	graptolite zone	English formation	Baltic Stratigraphic sub-zone
Wenlock	Homerian	latest	Monograptus ludensis	Wenlock
				Tickwood
		late	Gothograptus nassa

		middle	Crytograptus lundgreni

	Sheinwoodian	early
	Sheinwoodian