The Ordovician rocks of Pobroszyn in the Łysogóry region of the Holy Cross Mountains, Poland

Trela W., Salwa S. and Szczepanik Z. (2001) — The Or do vi cian rocks of Pobroszyn in the Łysogóry re gion of the Holy Cross Moun tains, Po land. Geol. Quart., 45 (2): 143–154. Warszawa. In the vil lage of Pobroszyn near Opatów, a faulted sec tion of Or do vi cian de pos its rep re sented by up per Tremadoc clayey-silty lithofacies, up per Arenig car bon ate-phosphorite lithofacies and Up per Or do vi cian claystones with lime stone interbeds, were iden ti fied. The up per Tremadoc is dated on ba sis of acritarch. This is the first time that up per Tremadoc de pos its have been doc u mented in the Łysogóry re gion. The late Arenig transgressive de pos its were prob a bly pre ceded by emer gence in the lat est Tremadoc and early Arenig. The Or do vi cian rocks from Pobroszyn are in tensely tectonised. Two groups of faults, oblique and lon gi tu di nal, are dis tin guished. The first one strikes from 120–140°, and dip to NE at 40–45°, and the sec ond one that strikes 15–25 ° and dips 65–80 ° to E.