Read carefully, study the cross-section: answer all questions Frenchgirl Valle T

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Read carefully, study the cross-section: answer all questions Frenchgirl Valle The diagram below represents a simplified and hypothetical geological cross- section, depicting the relationship of various sedimentary and igneous rocks beneath the surface A cross-section is a slice through the Earth's crust and in this image you are looking at a side-view of the rock layers that exist beneath that surface Different sedimentary rock layers are identified 'A' through to O', although units | 'K, and ‘G' are two different types of igneous intrusion. U238/Pb206 age dating the intrusion 'K' gave a date of 430 Million Years, age dating the intrusion 'G' gavea date of 490 Million Years and age dating 'A gave 560 Million Years. Note, rock | unit·L' contains fossils (Ammonites), which are lower Jurassic age fossils. Note the presence of an Angular Unconformity at the base of rock unit L You will need to refer to the Geological Time scale and apply one (or more) geological principal as you work through this assignment. ) Of the following choices, which is the oldest rock? a. Granite 'G b. Intrusion K c. Rock unit ' 2) What geological principle(s) did you use? la. Crosscutting relationships b. Superpositionc c. Original horizontality d. Both a andb e. Both b andc f Both a, b and c 3) Of the following choices, which is the youngest rock? a. Granite 'G b. Intrusion K" c. Rock unit F' d. Rock unit T e. Rock unit M" 4) What geological principle(s) did you use? Ia. Crosscutting relationships b. Superposition . Original horizontality d. Both a and b e. Both b andc f. Both a, b and c 5) To which Geological Period/Periods do rocks units 'G' & K' belong? 8) Can rock unit 'L' be correlated across the French Girl Valley 8) What does the 'wiggly line' at the base of Rock Unit'L'represent? Which Geological Periods are missing?

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