BU 42.3/3, chert from Kleinnaundorf/Burgk, detail
Fig.3: The sterile pinnules (dark) are well visible within the
chert. Two pinnules on the right are cut perfectly
in-plane, with forked veins clearly visible. Cross-cut pinnules are seen centre
left. The object above
left may be a remain of a Calamite (inclined section). coll. & photograph:
G. MÜLLER/Dresden