Plate P3. Magnification for light micrography is 2200x. Light micrography: PH = phase-contrast light, PL = plain transmitted light, XP = cross-polarized light, SEM = scanning electron micrography. 18, 19. Cylindralithus duplex, Sample 173-1069A-12R-2, 99-100 cm, PH (18) and XP (19).