Silurian graptolites and chitinozoans from the Uranium Industry boreholes drilled in 1968 - 1971 (Prague Basin, Bohemia)

Evaluation of the stratigraphical distribution of the lower Silurian graptolites and chitinozoans obtained from the Uranium Industry Geological Survey boreholes in the Prague Basin drilled in the period 1968-1971, has provided new data on the thickness of some graptolite zones and on the distribution of graptolite and chitinozoan assemblages. Data which could not be published before 1989 are supplementary to the data obtained from the surface sections.