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Archaeopteris

Archaeopteris is an extinct genus of progymnosperm tree with fern-like leaves. A useful index fossil, this tree is found in strata dating from the Upper Devonian to Lower Carboniferous, the oldest fossils being 385 million years old, and had... Wikipedia
Scientific name: Archaeopteris
Class: †Progymnospermopsida
Family: †Archaeopteridaceae
Genus: †Archaeopteris; Dawson (1871)
Kingdom: Plantae