s). Similar artifacts are found all over the world, including China. Formation and morphology While varying in specific morphology, metates adhere to a common shape. They typically consist of large stones with a smooth depression or bowl worn into the upper surface. The bowl is formed by the continual and long-term grinding of materials using a smooth hand-held stone (known as a mano). This action consists of a horizontal grinding motion that differs from the vertical crushing motion used in a m… (More on Metate)