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Nowe dane na temat wystąpień szkarłupni w wapieniu muszlowym (środkowy trias) Górnego Śląska

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Paszcza K.

tom Vol. 72, nr 4

156--161

In the Sadowa Góra quarry in Jaworzno, southern Poland, the Muschelkalk deposits are exposed (Lower and Upper Gogolin Beds). The occurrence of echinoderms seems to be particularly interesting. The isolated ossicles of asteroids were found already in the 1st Wellenkalk of the Lower Gogolin Beds (Aegean), which is one of the oldest post-Paleozoic occurrence in the world. Until recently, it was believed that the first echinoids appeared in the Germanic Basin during the Bithynian (above the Conglomeratic Horizon of the Upper Gogolin Beds). Currently, they have been found, similarly to the remains of asteroids, already in the 1 st Wellenkalk. Attention was also drawn to the fact that the stratigraphically important crinoid species Holocrinus dubius may have appeared in Upper Silesia earlier than previously thought.

Skały silikoklastyczne triasu i jury niecki łódzko-miechowskiej w aspekcie rozwoju ich przestrzeni porowej

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Kuberska M. , Kozłowska A. , Wołkowicz K.

2023

tom Vol. 71, nr 4

212--218

Triassic and Jurassic siliciclastic rocks from boreholes drilled in the Łódź and Miechów troughs to the SW of the Mid Polish Anticlinorium have been subjected to petrologic studies. The are represented by claystones, mudstones, sandstones, and less frequently by conglomerates. The studies shows that the filtration and reservoir properties of the Triassic deposits not good due to diagenetic processes (compaction, cementation, replacement, dissolution). Only some Lower Triassic sandstones, occurring among others, as intelayers, display increased values of permeability and porosity (to about 27 vol. %). The best properties are display ed by sandstones from the Brzegi IG 1 borehole, in which macropore intergranular space is present. The Lower Jurassic rocks are characterized by the best properties within the Jurassic complex. They show increased values of mostly secondary porosity, which results from the dissolution of grains and cements. The pore space is developed homogenously. It has a micropore character in the Middle and Upper Jurassic deposits.