The Ordovician in the Koszalin-Chojnice region (Western Pomerania)

Abstract

Within the strongly tectonically disturbed region of Koszalin-Chojnice, fragments of Ordovician sediments have been found in 12 boreholes drilled by the Oil Research Survey and in two other ones drilled by the Geological Institute. On the presence of graptolites these sediments, developed in a silty facies, have been referred to the Llandellian and Caradocian including the Dicranograptus clingani Zone. In the SE part of tile above region the occurrence has been noted of tuffite layers.