Fig. 6From: Exceptional stegosaur integument impressions from the Upper Jurassic Morrison Formation of WyomingDetail of the impression of the presumed keratinous covering of the plate, showing low parallel ridges extending from the upper left to the lower right corner. Note the remains of the dark layer that cover the impression in the central lower part of the picture. Preserved as a natural cast. Scale bar 1 cmBack to article page