geo lab 1

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School

Woodland Community College *

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Course

15L

Subject

Geology

Date

Apr 3, 2024

Type

pdf

Pages

5

Uploaded by KidChimpanzeeMaster1022

- - - - • Ill!) Exercise 1 PROCEDURE PART A Using the dating techniques discussed above, determine the sequence of geologic events repre- sented in each of the block diagrams in figure 1.6. A B A youngest C oldest + FIGURE 1.6 Block diagram exercise. (continued) C Relative Dating and Unconformities I 0 <) ooo o Oo c · o 0 c, 0 <:)o· ~-o .o (::) <::) &J o,.o .0. (:) ~o-o o ~o c:,. o • o 0 o · 1:, · CJ o"" o 0 o t,. ·0 0 o.0 () 0 0 o Q.o <::) o <::).o •<::) .o ot:,o o o .o,::io . o (:>. C 9 a•oO E .Ci,•-o•c,O <::,o p. ~- ~<:> 0 C? JO <::> 0· 0 0 'i::)0. youngest oldest s D A c youngest & e J M l, :c A F B oldest 1 · I I
Exercise 1 Relative Dating and Unconformities B - - · G:-~---_-_-_- - - - - - ---- ---- - - D I. i youngest p E youngest 6 I • b 14 K J" E oldest C L- oldest -- · · - · ••• ,,. • • • - ····· -~- The Grand Canyon is one of the most spectacular laboratories of historical geology in the world. Use the cross section of the eastern Grand Canyon (figure 1.7) to answer the following questions. For questions 1 through 5, indicate which principle(s) of relative dating guided you in arriving at your answers. 1. What is the oldest body of rock in the Grand Canyon? .:.. \Vhat is the oldest sedimentary layer in the Grand Canyon? l.-\W\lS~C. Principle(s) ~pe:r p,es-:i\H.'o'l\, O.Yil~\~\.. ~V-\Ul>Y\~- 3. What is the youngest Precambrian formation in the canyon? Dox Principle(s) cross-~,(~onsh\('S. Principle(s) uper p~1H-ion
• iii • • • • • • - • • • Iii Iii - - • - • :iii :iii .. ... -- Iii I@ ,M • if Exercise 1 4. What is the oldest Paleozoic formation exposed in the canyon? Principle(s) $ u ¥J~r~iA-;0'n 5. What is the name and lithology of the youngest formation? • _ . 1 V\-Cl.1 L l ~,l7o:h~,; \' ~h>in~ Principle(s) ~C\ pew--kl)'O'Si Hot1 w SURPRISE- FORMATION ........ _ ............ _._, .... ""T""'-__,_""-r-"""T"""-,r---r-'-111 (Pennsylvanian) ; .... i .... , ........... ,_~---'-'T""...,_._-r-'-T--'--r-''-r-'-r-'tl ------------ ___________ .. ------------ BUTTE CT'" (Devonian) - . Granite Schist Sandstone Shale Limestone Relative Dating and Unconformities 6. What formations comprise the Cambrian Sys- tem in this area? TtlpfA~ <Sa~J;-or,e;,,I ~t $,l,1)/U£ 1 Ma.uv l'i e. , 7. Visually trace the unconformity at the base of the Tapeats Sandstone from left (west) to right (east) across the diagram. How does the nature of the unconformity change from west to east? 4-ru, lAVIGOVltt>Y-Mil---"I CMa"'o~ (;-om °" V\.OV\ eo Vl to r-W\ i ry on J +w., w es+- 61de. _.,, c:t Y1 a~tAlctt-: UV\C-OVlt:orrnif-"'I Oh + ½ e ea.s.+- E ) • ,, COCONINO SANDSTONE ',, .. A' ·g • V _ _ _ _ _ HERMiTsHAi:E =-~ -==== o.. ===I~ - -=-.:;;;;: SUPAI G - -- & · ------------- -•-- · ------ ___ , ·------ ·------ ___ , -------------------- fl) .___._ ........... ..&...p...14 fl) ............. -r-L...rl j ---------~- ----------~~~--~ ---------- •••• FIGURE 1.7 Geological relationships in the eastern portion of the Grand Canyon, Arizona.
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