Lamellae of second order (white highlighted area) subdividing first-order lamellae. Black dotted line highlights
the boundary between adjacent first-order lamellae. Note the different dipping directions of second-order lamellae in adjacent first-order lamellae. Third-order lamellae with
a rod/lath-like appearance subdivide second-order lamellae. Orientation of length, width and height axes of second-/third-order lamellae in respective image sections are
illustrated below