Amphora maria from Arroyo Hondo, Maria Madre Island, Mexico. Single example on the slide. Fossil marine material from the Miocene. Mounted in Naphrax and dated October 1969. Prepared by ECP Bone. Olympus BHB microscope using 450nm LED light. In addition to imaging the arrangement I also imaged them both individually at higher magnification. 63x Leitz Pl Apo 1.4 objective, oil immersion. Olympus Aplanat Achromat condenser, oil immersion, oblique lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 39 image stacked in Zerene (Pmax).
Amphora maria G.D.Hanna & Grant 1926. Published in: Hanna, G.D. & Grant, W.G. (1926). Expedition to the Revillagigedo Islands, Mexico, in 1925, II. Miocene marine diatoms from Maria Madre Island, Mexico. Proceedings of the California Academy of Sciences, series 4, 15(2): 115-[193]. [in English]. Page 124, Plate 12, Figure 6.