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The Devonian

https://ucmp.berkeley.edu/devonian/devonian.html

“The Rhynie Chert in Scotland is a Devonian age deposit containing fossils of both Zosterophyllophytes and Trimerophytes, the two major lines of vascular plants. This indicates that prior to the start of the Devonian, the first major radiations of the plants had already happened. The oldest known...” (from the page’s text)

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