Dark Bands in the Submarine Nankai Accretionary Prism – Comparisons with Miocene–Pliocene Onshore Examples from Boso Peninsula - Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin - page 233

Fig. 3 Sample photos and photomicrographs showing dark bands in samples from the Nankai
accretionary prism. The bands are thin (a few to tens of millimeters thick), planar and dark. ( a , b )
YK05-08 Leg 2, 6K#893 R-3. ( c , d ) YK08-E04, 6K#1056 R6-2. ( e , f ) YK08-E04, 6K#1060 R2-1.
( g , h ) YK08-E04, 6K#1060 R2-2. YK08-E04 6K#1060 samples also include vein structures