MasteringGeology MasteringOceanography. Pre-lab Quiz 14: Geclogic Time and Event
ID: 293184 • Letter: M
Question
MasteringGeology MasteringOceanography. Pre-lab Quiz 14: Geclogic Time and Events Google Chrome Secure https://session.masteringgeology.com/myct/itemView?assignmentProblemlD 7579634 Part A - Describing the History of the Grand Canyon Below is a events labaled with lecters. Please use the geologie la ws of relative dating to order these events from the first event that occumed to the last event hat occured W (depositi epasition(erosion) E (tilt of Q, L, Z) Q (deposition) Event to Last Event. Reset Help Deposition ofL TitE Deposnon of W Deposition of B Deposition of Depositon oQ Erosion F First Event Last Event Submit Part B This question will be shown after you complete previous questions) Part C-Explaining Erosional Surfaces This scene at the Grand Canyon has two erosional surfoces alang either side of the very top set of rock layers These erosion surfaoes are marked with blue lines in the photograph below. Which geologic lew indicates that these rock layers used to be wider across (from left toExplanation / Answer
(First event) Deposition of Q ----> Deposition of L ---> Deposition of Z ---> Tilt E ---> Erosion F ---> Deposition of W ---> Deposition of B ( Last event)
Explanation: From the principal of horizontality, we know that sedimentary layers are initially deposited horizontally and from the principal of superposition we know that in an undeformed sequence of strata, older beds are generally deposited at the bottom of the sequence while younger layers are at the top. Thus we can conclude that the bottom layer Q is the oldest unit which is followed upwards by L and Z layers. These layers were initially deposited horizontally which were later tilted. The tilting event was finally followed by an erosional unconformity surface above which the deposition of W and B units took place again following the principal of horizontality and principal of superposition.