Photograph 4
From: The planktonic foraminifera of the Jurassic. Part I: material and taxonomy
Gnaszyn quarry–Częstochowa area, Poland. 1 General view of the Gnaszyn Quarry with location of studied section, 2 position of Gn 6 sample, 3 the dark Bathonian shales of Częstochowa ore-baring clays