Collected in a creek bed near Gunnedah, NSW, Australia. The sediments date back to the late Pleistocene about 52 000 years ago and contain fossils of the Australian megafauna: kangaroos, diprotodontids, marsupial lions, crocodiles, birds and various others.
The bone is 75 mm long and as you can see is almost dead straight! There is a circular cross section with thick bone walls at one end and a generally circular cross section with thinner bone walls at the other end. I first thought some kind of bird limb bone, but the thick bone wall at one end didn't make sense. Now i am thinking kangaroo metatarsal but would like more opinions.