GEO 102 Lecture 18 Outline of Last Lecture I What is Ichnology Outline of Current Lecture II Tectonics and Sediments III Common clastic sedimentary rocks IV Chemical sedimentary rocks Current Lecture Tectonics and Sediments The distribution of all these processes is patterned based on plate tectonics Uplift and long term preservation of these rocks is controlled to a great extent by plate tectonics o Think about California beaches as compared to Alabama beaches The Rocks Once sediments settle they may cement The cement often comes from water with minerals in the solution Compaction contributes to this Common Clastic Sedimentary Rocks Conglomerate o Big clasts poorly sorted Sandstone o Smaller clasts better sorting Siltstone o Tiny clasts well sorted Shale o Nearly pure clay Shale is the most common Sandstone is the toughest All are abundant in Alabama These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Chemical Sedimentary Rocks What happens when you leave a glass of sweet tea in the fridge for too long What about when you don t clean your bathtub often enough As a solution becomes more concentrated in a mineral it will solidify on an available surface precipitation Evaporates salt Limestone Chert Dolostone Coal Organisms make many chemical sedimentary rocks limestone chert coal Coal not really a rock plant material deposited in an anoxic environment like a swamp or bottomland forest compacted
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