GEO 102 Lecture 18 Outline of Last Lecture I. What is Ichnology Outline of Current Lecture II. Tectonics and SedimentsIII. Common clastic sedimentary rocksIV. Chemical sedimentary rocksCurrent LectureTectonics 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 tectonicso Think about California beaches as compared to Alabama beachesThe 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- Conglomerateo Big clasts, poorly sorted,- Sandstoneo Smaller clasts, better sorting- Siltstoneo Tiny clasts, well sorted- Shaleo Nearly pure clay- Shale is the most common- Sandstone is the toughest- All are abundant in AlabamaThese 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)-
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