The sediments of the, Cambrian, Lancara Formation show features which suggest their deposition in a shallow marine environment. The occurrence of stromatolites might indicate that some sediments were deposited in an intratidal environment. The gradual change, upward in the stratigraphie section, from stromatolite deposits via calcarenites to argillaceous limestones and shales is being interpreted as a transgressive marine sequence. The possibility of a penecontemporary dolomitization of the lower part of the formation followed by secondary, post Namurian?, dolomitization is suggested.