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 234

Fig. 4 Outcrop photos and photomicrographs of type 1-1 and 1-2 dark bands from the Boso
Peninsula. ( a - c ) Outcrop photos of type 1-1: the dark bands are parallel to bedding. Some type
1-1 bands cut vein structures, others are cut by vein structures. ( d ) Outcrop photo of type 1-2: the
dark band is subparallel to bedding. Some type 1-2 bands cut across bedding planes.
( e ) Photomicrograph of type 1-1: clay flakes are concentrated and rearranged to form the pre-
ferred orientation, in particular, along the boundary between type 1-1 bands and the host rock.
( f ) Photomicrograph of type 1-2: grain alignment in the dark band cuts obliquely across that of
the host rock (Modified from Michiguchi and Ogawa ( 2011 ))