Archaeopteris
Archaeopteris An early progymnosperm (see PROGYMNOSPERMOPSIDA) found in the Frasnian stage of the Devonian Period. It is known first by its fronds, and is the first representative of the Archaeopteridales.
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Stage , Stage (or Phase)
The term "stage" is used to designate a developmental phase that, for Freud, is characterized by a specific organization of the libi… Oxygen-isotope Stage , oxygen-isotope stage One of the glacial or interglacial stages revealed by oxygen-isotope curves. Curves from Atlantic and Pacific deep-sea cores wer… First , first / fərst/ • ordinal number 1. coming before all others in time or order; earliest; 1st: his first wife the first of five daughters ∎ never previ… Blastula , blastula The stage of development of an animal embryo that results from cleavage of a fertilized egg. This stage generally resembles a hollow ball wi… Baragwanathia longifolia , Baragwanathia longifolia One of the earliest known vascular plants (see TRACHEOPHYTA). During the Devonian and Carboniferous, the lycopods (club moss… Frasnian , Frasnian (Frasien)
1. An age in the Late Devonian Epoch, preceded by the Givetian (Middle Devonian), followed by the Famennian, and dated at 377.4–36…
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Archaeopteris