HARRISVILLE, MI - A longtime rock aficionado was doing a little hunting on a Lake Huron beach near Harrisville last month when she found something that stumped her: a small, smooth gray rock that ...

Crunching along a rocky Fox Island beach Thursday afternoon Tonya Strickland stopped for a moment, a smooth gray-blue rock catching her eye. Matte, light and perfectly rounded, the stone was a ...

An obscure rock formation on the eastern shore of Canada's Hudson Bay may contain the oldest known rocks on Earth, a new study claims. The analysis dated the site's streaky gray rocks, part of an ...