Metamorphic and intrusive rocks formed ca. 1.75 Ga may have provided sediment for the structurally higher and younger quartzite. The ca. 2.7 Ga detrital zircon population in the Nepewassi quartzite ...

The sediment comes from eroded rocks carried there by rivers or ice, and from the skeletons of sea creatures. Metamorphic rocks close metamorphic rockMetamorphic rocks are those rocks which have ...

and metamorphic. There are over 4,000 identified minerals on Earth. Common rocks include granite, basalt, limestone, and sandstone. The most common rock-forming minerals include quartz ...