Chert is a bit like basalt, in that most of it sits on the deep seafloor and is recycled by plate tectonics. Not that much of it is preserved on land, so it's more important in the bigger scheme of things than it might seem to us air-breathing geologists. Chert appears to be a major agent in bringing silica back to the continents it eroded from. Learn more of the details about this nondescript sedimentary rock type in this new article, "About Chert."
Radiolarian chert Geology Guide photo