4/9/10 12:55 PM GEOSC 10: Geology of the National Parks (Web, merged), SP10 Page 1 of 9 RockOn #10 Submitted by sjk5180 on 4/9/2010 12:26:43 PM Points Awarded 13 Points Missed 1 Percentage 93% The next four (4) questions refer to the diagram above. This diagram shows a geologic cross-section of some rocks, such as you might see in a cliff. The tree is growing on top of the modern surface. Rock layers A, B, C, D, E, and F are sedimentary; E contains mud cracks and fossil footprints as shown. G is igneous rock that hardened from hot, melted rock. H, I and J are faults, and K and L are unconformities. Sedimentary rocks are right-side- up unless there is some indication given to show something else.
4/9/10 12:55 PM GEOSC 10: Geology of the National Parks (Web, merged), SP10Remember that footprints and mudcracks tell you whether rocksare right-side up or upside-down, so look for those. Also, if alayer is upside-down, so are the layers that are in the samesedimentary pile, until you hit an unconformity. So, if you havelayers Q, R, S and T in one sedimentary pile beneath anunconformity, and then layer U above the unconformity, and youlearn that Q is upside-down, so are R, S, and T, but you mustlook for more information to tell which way is up for U.Referring to the rocks you see here ......1.Which is the oldest sedimentary rock layer: Page 2 of 9 A.FB.BC.CD.DE.EThe package of sediments C, D, E, and F is upside-down, as shown by the footprints and mud cracks, so C is the oldest one.Correct Answer:CYour Response:C Points Earned: 1/1 2.Which correctly gives the order of the faults, from oldest (first) to youngest (last): Points Earned: 1/1 3.Which is younger:
4/9/10 12:55 PM GEOSC 10: Geology of the National Parks (Web, merged), SP10 Page 3 of 9 Points Earned: 1/1
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