Liam Murphy - GEOL200 - Lab Assignment 08 [MARKED]

Liam Murphy 3540040 GEOL 200 - Introductory to Physical Geology Lab Assignment #8 August 241, 2021 Part One e Complete Activity 9.4, Topographlc Maps and Orthmmage Interpretat:on, Parts A \ (1 -7) B (1 -2), and C (1-2) in the Laboratory M'anudl (pages )2(59 261). ) A. Figure A9.4.1 is a portion of the 1989 SP Mountain, AZ 7.5-minute topographic quadrangle map. The black 1km by 1km UTM grid is NAD27, Zone 12S. Also note the 1mi by 1mi PLSS grid sections with red numbers in their centers. ST IR 1Y T8 ‘;\}yhat is &he point of highest elevation on the map, and how can you tell? A vy 7021 feet 5 The contour intervals on this map are 40 feet so having a specific elevation at the top of SP Mountain would indicate to me that this is the highest elevation. ‘Te 2 2. Draw a small “x” over the point of lowest elevation on the map, and label it with the elevation. Q/ 6080 feet fl;\ See below figure. S Q’U"Q 3. What is the total relief of SP Mountain measured from its base to the north of the peak up to its highest elevation? (in feet) Elevations o Highest Point: 7021 feet (Peak of SP Mountain) g o LowestPoint: 6080 feet g (Q\B 0 99 o Relief: 941 feet N w Total Relief: 941 feet 5”{ ( 4. Circle the four places within the map where streams (blue) begin. How can you tell which direction is upstream based on the contours? 5 Major contour lines are generally marked with the elevation (i.e. 6600 feet or 6200 feet) by finding one end of the stream and then following the stream and determining if the stream is running uphill or downhill from the start point will indicate where the start of the stream is based on the contour lines (water always runs downhill so the start of the stream would be at the highest point of the stream indicated on the map). See below for circled locations. 5. Notice that there is an SP Mountain and an SP Crater. How can you tell which part is the crater? Colour it red. A crater (or depression) on a topographical map will have small dashed marks all around the contoured line for that area [O indicating (especially in this case) that there Icrater on the top of a mountain or there is a depression in the landscape. See below figure for location of crater. () Liam Murphy Unit 10: Deserts and Wind Action GEOL 200 Lab Assignment #8 Athabasca University Page 1 of 5 August 24t 2021

NT PRV €D 6. | Describe the north - south diameter (in km and mi.)jand three dimensional shape of SP Mountain, and interpret what kind of geological feature it might be. Use the UTM and PLSS grids to help with scaling. % o All contour lines in this area are evenly spaced indicating an even slope up to the peak of SP Mountain. { o Based on the even slope of he mountain (and steepness of the mountain) partnered with the crater at the top of SP Mountain it is a fair judgement to say this mountain has a resemblance of a Cinder Cone Volcano. 7. Based on your answer above, what material do you think is represented by the orange-brown colour (section 34)? / o This would appear to be a built up area/disturbed area. This could have occurred several ways (landslides etc.) 2_ « but with this bearing the resemblance of a Cinder Cone Volcano a more likely explanation is the build-up of voleanic debris (ash, volcanic rock etc.) in this area causing a build-up. C\oge 15 A hy lova Qow e M@gfifae‘t # Liam Murphy Unit 10: Deserts and Wind Action GEOL 200 Lab Assignment #8 Athabasca University Page 2 of 5 August 24, 2021

Liam Murphy Unit 10: Deserts and Wind Action GEOL 200 Lab Assignment #8 Athabasca University Page 4 of 5 August 24t, 2021

C. Compare the 2014 topographic map (Fig. A9.4.2A) with the 1989 map (Fig A9.4.1) 1. How are the contours different in the 2014 map? o The contour lines on the 2014 map are much smoother and less jagged than the 1989 map indicating the L : weathering and erosion of the mountain faces. SP Mountain is physically shorter in the 2014 map, on the 1989 map there is a major contour line for 7000 feet and this major contour line is not shown on the 2014 map, the highest approximate elevation in 2014 would be ~6960 feet. o SP Mountain and the old volcano to the south have a physi separated in 1989 (at 6600 feet). 1A tll;(?onnecting ridgeline now that was previously { 2. What is the one thing that changes on the ground in this area from 1989 to 2014? e - P Part Two { o There s little to no vegetation left within the “crater” of the old volcano to the south or along the westerly side of SP Mountain. "ij b Complete Figure 8.1 (next page) by indicating in the spaces provided whether the option would be a good or a poor data source for the identified task. Please note that, in some cases, the topographic map and stereoscopic aerial photographs may be good (or poor) for the task. Task l Topographic Map l Stereoscopic Aerial Map Good Data Source Determining precise elevations v~ Poor Data Source l/ Eg‘t,z';'“i“ing extant of vegstation Poor Data Source Good Data Source [/ Determining extent of snowlice cover Poor Data Source Good Data Source v Measuring angles of slopes Good Data Source [~ Poor Data Source v/ Examining terrain in great detail Good Data Source V' Good Data Source l/ g:f:f:g’ndt‘;se"g::t"hqst';i:?:::"’" ofa Good Data Source v ‘gw%e\ Good Data Source X Identifying local rock or soil types Poor Data Source v P Good Data Source o/ Constructing a topographic profile Good Data Source E. Poor Data Source v (':;e;";?g:g erigssiFirom gstiifig loat Good Data Source /. Good Data Source / Liam Murphy GEOL 200 Athabasca University Page 5 of 5 >3 Unit 10: Deserts and Wind Action Lab Assignment #8 August 24, 2021