They are characterized by fine cycads (Zamites arcticus and Glossozamites Hoheneggeri), which also occur in the Urgonian strata of Wernsdorff.
Those pre viously described as Zamites gigas (fig.
15, 4), and the fronds of Zamites gigas, now known as Williamsonia gigas (fig.
Williamson was the first to express the opinion that the Bennettitean flowers known as Williamsonia were borne on the trunks which terminated in a crown of pinnate fronds of the type long known as Zamites gigas; this view was regarded by Saporta and others as incorrect, and the nature of the Bennettitean foliage was left an open question.
Androstrobus Balduini from Bathonian rocks of France; Zamites familiaris, described many years ago by Corda, from Lower Cretaceous rocks of Bohemia, and Androstrobus Nathorsti, from Wealden beds in Sussex.