O możliwości wykorzystania piaskowców warstw istebniańskich z okolic Dobczyc

Abstract

ON POSSIBILITY OF UTILZING THE SANDSTONES OF THE ISTEBNA BEDS FROM THE DOBCZYCE REGIONDegree of utilization of the Flysch sandstones occurring in the Dobczyce region is not at all satisfactory. The sandstones belonging to the lower Istebna beds are not being exploited at a larger scope almost in none of the numerous quarries in this region (Fig. 1). These are sandstones of various grain sizes, mostly medium-grained, less often coarse-grained and conglomeratic, for the most part, however, medium and thickbedded. The thickness of the banks ranges from 0;5 to 7,0 m.; usually it amounts 2-3 m. The individual banks are separated by interbeddings of grey-green shales with plant detritus, from 2 to 20cm thick. Sporadically there occur also interbeddings of grey, clayey shales (Fig. 2). Weathered feldspars, tiny muscovite flakes and sometimes glauconite grains may be. observed in the sandstones as well. Their cement is clayey, clayey-calcareous and clayey-siliceous, at places. The sandstones are white, grey-white or yellow-rusty in colour. In deped parts of the quarries, where fresh-rock material is exposed, the sandstones are of steel-grey colour, which rarely appears on the surface.