Which gymnosperms order includes all fossil plants?
It was during the late Palaeozoic era that gymnosperms have originated and flourished in Mesozoic age. During this period, cycadofilicales also called pteridospermae, have prominence mainly early fern-like seed bearing group. These cycadofilicales are an evidence of the origin of gymnosperms from an ancient stock of fern-like individuals. Examples of other cycadofilicates are Neuropteris decipiens, Medullosa noei, Lygenopteris.
So, the correct answer is 'Cycadofilicales'