Branch of Sigillaria sp. with attached leaves (!).
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Liévin (Fr). Collection and photos: Bruno Vallois

Part of a leaf of Sigillaria sp. Length 12 cm. Coll. Bart Vernooy.
The leaves are lying mostly detached in the sediments. They have a
ridge on the upper side and two small furrows on the lower one.
They can be very long (up to 1 m). The length depends on the
age of the tree. Leaves of Sigillaria are called Sigillariophyllum.