Check the listing for details. Thin-section Mount from DSDP Hole 485A Petrographic Microscope Slide 485A-12-1. Listed at 45.00 USD. Thin-section mount of core sample from the Deep Sea Drilling Project (DSDP) Leg 65, Hole 485A, Core 12-1, East Pacific Ridge in Gulf of California. For viewing under transmitted or polarized light.