In last week's Science, his group says that the
outer ring is the original crater
rim, formed 65 million years ago at the end of the Cretaceous period and since buried under a layer of limestone up to 1000 metres
thick.
The
outer rim of the Galaxy Note 10.1 is highlighted with
thick strip of aluminum that has small grooves, although you barely feel the grooves when you're normally handling the tablet.