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Iron-rich sedimentary rocks
Iron-rich sedimentary rocks are sedimentary rocks which contain 15% or more iron. However, most sedimentary rocks contain iron in varying degrees. The majority of these rocks were deposited during specific geologic time periods: The Precambrian (3800 to 570 million years ago), the early Paleozoic (570 to 410 million years ago), and the middle to late Mesozoic (205 to 66 million years ago). Overall, they make up a very small portion of the total sedimentary record.
Iron-rich sedimentary rocks have economic uses as iron ores. Iron deposits have been located on all major continents with the exception of Antarctica. They are a major source of iron and are mined for commercial use.〔Boggs Jr., Sam, 2006, ''Principles of Sedimentology and Stratigraphy'' (4th ed.), Pearson Education Inc., Upper Saddle River, NJ, pg. 217-223〕 The main iron ores are from the oxide group consisting of hematite, goethite, and magnetite. The carbonate siderite is also typically mined. A productive belt of iron formations is known as an ''iron range.''〔
==Classification==
The accepted classification scheme for iron-rich sedimentary rocks is to divide them into two sections: ''ironstones'' and ''iron formations'' 〔
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