fossiliferous chert from the type locality of Scolecopteris near Freital
Surface of a fossiliferous chert sample with remaining sandstone
as a
typical feature of the Freital site. This feature is seen on many samples
assigned by HEINRICH COTTA to
Ruedigsdorf, indicating erroneous labelling.
coll. KRETZSCHMAR/Chemnitz, width of the picture 25 mm