Fig. 3 in First Jurassic brittlestar from Neuquén Basin, Argentina

Fig. 3. Microscopic characteristics of the ophiuroid-bearing level. In all photomicrographs it is possible to identify the matrix (mtx). A. Photomicrograph of the level containing the ophiuroid fossil, showing phytodetritus (Ft), lithic fragments (Lt), muscovite (Ms), plagioclase (Pl), and angulose quartz (Qz). B. Photomicrograph of the level containing the ophiuroid fossil, showing biotite (Bt), phytodetritus (Ft), lithic fragments (Lt), plagioclase (Pl), framboidal pyrite (Py), and angulose quartz (Qz). C. Photomicrograph of the level containing the ophiuroid fossil showing biotite (Bt) and glauconite (Gl). D. Photomicrograph of the level containing the ophiuroid fossil showing fragments of bryozoans (Br), biotite (Bt), phytodetritus (Ft), and framboidal pyrite (Py). E. Photomicrograph of the level containing the ophiuroid fossil showing foraminifera (Fo), and phytodetritus (Ft). F. Photomicrograph of the level containing the ophiuroid fossil showing piritized bivalve (Bv), phytodetritus (Ft), and plagioclase (Pl).