hw9 - HOMEWORK #9, GEOLOGY 1020, Spring 2008 1. Coastal...

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HOMEWORK #9, GEOLOGY 1020, Spring 2008 1. Coastal dunes and desert dunes will both be made up of very well sorted sandstones with large scale cross bedding. How do we tell them apart in the rock record? A. coastal dunes form fan like geometries whereas desert dunes form blankets B. coastal dunes will be associated with marine shales whereas desert deposits will be associated with sandstones that have bi-directional cross bedding. C. coastal dunes have bits of marine fossils and form long linear ribbons; desert dunes do not have fossils and form blankets of sandstone D. coastal dunes have no fossils and form blankets of sandstone; desert dunes have fossils and form long linear ribbons The next 5 questions concern the figure below. The youngest rocks are at the top of the section. 2. What is the most definitive characteristic of facies 2 – that is, what attribute of facies 2 is the single most important feature in allowing you to determine its depositional environment? A. the rock type - shale B. the burrows C. the fossil types D. its association with the sandstones of facies 3
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3. What type of environment would you interpret for the lenses of sandstone with unidirectional cross bedding (facies 7)? A. desert dune
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This note was uploaded on 04/22/2009 for the course GEOL 1010 taught by Professor Pranter,ma during the Spring '07 term at Colorado.

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hw9 - HOMEWORK #9, GEOLOGY 1020, Spring 2008 1. Coastal...

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