O wieku pstrych utworów z Liplasu

Abstract

ON THE AGE OF MOTTLED FORMATIONS AT LIPLASSummaryA 1370 m thick series of mottled claystones, siltstones, sandstones and conglomerates, with gypsum and anhydrite, were found by bore hole Liplas 2, situated south west of Cracow. These deposits rest on the Lower Carboniferous formations, and are covered with a series probably of Lower Jurassic age.On the basis of lithological  development, 4 complexes have been distinguished here from bottom to top: 1 – sandstone-conglomerate complex, 2 - sandstone-clay complex, 3-sulphate-clay complex, and 4-clay-sulphate complex. No macrofauna fossils were found in the series examined. On the other hand, the following representatives of foraminifers were encountered: Hyperammina compressa P a a l z o w, Nodosinella tenera S h e r p, Ammodiscus bradynus S p a n d e l and Spandeloinoides cf geinitzi (R e u s s). All the above species are characteristic of the Zechstein formations. Except for Nodosinella tenera, they are abundant in the Zechstein deposits also within the other areas of Poland. So far, this form has not been found in Poland. It is known, to occur in the north-western area of the GFR in the Lower Zechstein deposits. The representatives of the form Endothyra sp. (a genus characteristic of the carboniferous formations), encountered in the mottled deposits, are thought by the present authors to be redeposited. The uppermost part of the mottled series may down to a depth of 1165 m, already belong to the Buntsandstein.The Zechstein deposits discovered by bore hole Liplas 2 occur at present in a graben characterized by a NW-SE direction. During sedimentation of Zechstein deposits this area was probably a narrow bay characterized by a rapidly sinking bottom responsible for the formation of the deposits of such a considerable thickness.