GEOL 102 1st Edition Lecture 3 Outline of Last Lecture I. Origin of the Earth and Geologic timeA. Used to understand the difference between relative and absolute geologic timeB. Geologic scaleC. Used to understand what rocks tell us about the age of the earth II. Devils LakeA. Quartzite formation hypothesisa. Loose grains of sand deposited by running water, then something happened to turn it into the hard rock we see todayIII. DispositionA. Particles set down by some sort of currenta. In ex. After a floodB. When running water is at work it tends to deposit things in a layera. Layer will be sub horizontalIV. Erosion A. Opposite of depositionB. Pick up and moveV. Ripple Marks A. Associated with grains moving from currentVI. Metamorphic rockA. (change Shape) B. Under high temperature and pressureC. Recrystallization (no melt) Outline of Current Lecture II. FossilsThese 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.A. Any evidence for a previous life formIII. SandstoneA. Is from the sedimentary rock familyB. Pieces put together VII. Things that could have moved the mountains at devils lakeA. Glaciersa. Would cause striationsi. Scratches on the rocksb. Would cause various types and sizes of rocks to be placedB. Rivers a. Would have to look for ripplemarks, sediment that doesn’t belong, river fossils, or rounded rocksC. Earthquakesa. Would look for jagged line, find tops elsewhere, fault line D. Volcano a. Lava flows, volcanic rock, beds of lava flows, jagged pieces of rock, volcanic
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