Mysterious Objects Solved by the Internet! (17 Photos)
A: A filling port on a large, sand-filled geotextile container. They are filled with sand and used for erosion control.
A: Definitely a form for making a sand mold to make a metal casting of some type of industrial bevel gear. Dig that thing out, and people would pay good money to hang it up or make a coffee table for industrial-chic decorating.
