Your SlideShare is downloading. ×
0
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Field assgt.
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Field assgt.

135

Published on

Published in: Travel, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
135
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
1
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Field AssignmentProfessor Lawler- Geology103By Kalie Ceglia
  • 2. • Geologic Evolution of Tahoe Basin and the Sierra Nevada• Rock Samples• Quartz• Agate• Granite• Plant Sample- ‘snow plant’• References
  • 3. Geologic evolution of Lake TahoeBasin(started 400 million years ago)• Lake Tahoe was formed by faulting• 3 faults make up the Tahoe Basin- West Tahoe Fault ( Sierra Nevada), East Tahoe Fault ( Carson Range),and the North Tahoe Fault• ‘Dropped down blocks ‘ formed the Basin in between• Soils include:- Andesitic volcanic rocks- Granodiorite- Metamorphic rockTahoefacts.com, 2013
  • 4. T. Macrae, 2009• The weight of the glaciers cause it to move and flow downhill• This creates U-shaped glacier valleys and V-shaped stream valleys
  • 5. The glaciers move through canyons like this one
  • 6. Glacier movement through river beds
  • 7. More recently:• About 10MYR ago, the real uplift of the Sierra Nevada happened:• Volcanic rock, sedimentary rock, and metamorphic rock were carriedaway to surrounding valleys, as a result there is still geologic evidencein the Tahoe Basin• As recent as 10,000yr ago, the last parts of the Ice age, glaciation washappening in the Sierra Nevada• How the Emerald Bay area was formed is an example of a lateralmoraine( where sediment is transported, then deposited along theridges)Monroe, 357, 2006
  • 8. Evidence of ScrapingAs the glaciermoves it picksup:• rocks• sediment• boulders• The boulders androcks scrape alongthe bedrock
  • 9. Approx. 6800ft, Near Eagle FallsTrail
  • 10. Lake Tahoe and BasinFeatures Metric unit English unitMaximum depth(second deepest in the U.S.)501 m 1,645 ftAverage depth 305 m 1,000 ftMaximum diameter(north-south)35 km 22 miMinimum diameter(east-west)19 km 12 miSurface area 495 km2 191 mi2Average surface elevation(above sea level)1,897 m 6,225 ftHighest peak (Freel Peak) 3,320 m 10,891 ftTahoe.usgs.gov,2013
  • 11. Topographical map of Emerald BayAmericansouthwest.net,2013
  • 12. The Glaciers Taking ShapeGlaciers:• Glaciers are very large bodies of snow and ice combined• When more snow accumulates than can melt, glaciers are formed• The snow begins to melt in the day but refreezes at night , this formsthe singular sheet of iceResendes, 2011
  • 13. Tahoebest.com, 2013Lower Eagle FallsLocation: South Lake Tahoe, Lake Tahoe Basin,El Dorado CountyStream: Eagle CreekAlternate Names:Height: 140 ft.Elevation: 6600 ft. (-350 ft.)Lat/Long:38.95185, -120.11029
  • 14. Americansouthwest.net,2013Topographical of Upper Eagle Falls and Eagle Falls LakeLocation: South Lake Tahoe,Lake Tahoe Basin,Eldorado CountyHeight: ~20 ft.Elevation: 660 ft.Lat/Long:38.94999N,120.11618W
  • 15. Lower Eagle Falls • During the Spring the snowmelts rush down from above,come mid-summer,it is only a trickle• Due to the number ofvisitors, there is anincreasing environmentalconcern for theEagle Falls area
  • 16. Standing on top of the Lower Eagle FallsFannette Island:This island is made of Granite, which resisted the force of the glacial ice.
  • 17. Upper Eagle FallsLocation: South Lake Tahoe,Lake Tahoe Basin,Eldorado CountyHeight: ~20 ft.Elevation: 6650 ft.Lat/Long: 38.94999N, 120.11618W
  • 18. UPPER EAGLE FALLS(TAKEN FROMTHE BRIDGELOOKINGDOWNSTREAM)
  • 19. Quartz found locally in the Lake TahoeBasinRockshop,2013
  • 20. Quartz: mineral•Form the continental crust•Most commonly clear, white (milky), or rose incolor•It is considered a hard and stable mineral•In metamorphic rock, it can become veineousand banded in appearancewww.backyardnature.net, 2013
  • 21. • Veins of quartz canprovide evidence ofhydrothermal activityGeology.com, 2013
  • 22. Agate:Semi-precious silicamineral• Microcrystalline variety ofsilica• Associated with and foundaround volcanic rocks orwhere volcanic activityonce occurred• Comes in a variety ofshapes and colors• Appears banded when cut
  • 23. More Agate( This was found in the middle of the trail and was the onlyother specimen than the picture before during the whole hike)
  • 24. GraniteGranite: The Sierra Nevada wasvolcanically active. Not a surpriseto find granite which wasat one time magma
  • 25. Granite: igneous rock, silicate• Granular• Intrusive• Varies in color: pink, white, gray, red• Mineral content: biotite, quartz, mica, orthoclase feldspar• Granite is part of the continental crust• It is magma from deep in the crust , cooled down and formed intorock then pushed up to the Earth’s surface
  • 26. SARCODES OR‘SNOWPLANT’
  • 27. Scientificname: SarcodessanguineaRank: SpeciesHigherclassification: SarcodesSarcodesSarcodes is a monotypic genus of a single springtime floweringplant in the heath family containing the single species Sarcodes sanguincommonly called the snow plant or snow flower.Wikipedia, 2013Found in the Sierra Nevada
  • 28. ReferencesBackyard Nature with Jim Conrad. (n.d.). Retrieved fromhttp://www.backyardnature.netEagle Falls Trail Lake Tahoe. (n.d.). Retrieved April 3, 2013, fromhttp://www.tahoesbest.com/eagle-falls-trail-lake-tahoeEmerald Bay SP. (n.d.). Retrieved 2013, fromhttp://www.parks.ca.gov/?page_id=506Facts about Lake Tahoe. (n.d.). Retrieved fromhttp://tahoe.usgs.gov/facts.htmlGoogle Image Result for http://www.aboutlaketahoe.com/hiking/topo-maps/emerald-bay-topo.jpg. (n.d.). Retrieved June 16, 2013, fromhttp://www.google.com/imgres?imgurl=http://www.aboutlaketahoe.com/hiking/topo-maps/emerald-bay-topo.jpg&imgrefurl=http://www.aboutlaketahoe.com/hiking/emerald_bay
  • 29. Granite: Igneous Rock - Pictures, Definition & More. (n.d.).Retrieved from http://geology.com/rocks/granite.shtmlGuyton, B. (1998). Glaciers of California: Modern glaciers, ice ageglaciers, origin of Yosemite Valley, and a glacier tour in the SierraNevada. Berkeley: University of California Press.Hill, M. (1975). Geology of the Sierra Nevada. Berkeley: Universityof California Press.Lake Tahoe Facts, Natural History, & Human Histroy. (n.d.).Retrieved June fromhttp://www.tahoeadventuresports.com/misc/tahoefacts.htmMacrae, T. (n.d.). Born of glaciers | Beetles In The Bush.Retrieved April 5, 2013, fromhttp://beetlesinthebush.wordpress.com/2009/03/17/born-of-glaciers/
  • 30. Monroe, J. S., & Wicander, R. (2006). The changing Earth:Exploring geology and evolution. Belmont, CA: ThomsonBrooks/Cole.Resendes (2011). Plate tectonics: Continental drift and mountainbuilding. Berlin: Springer-Verlag.Sarcodes - Wikipedia, the free encyclopedia. (n.d.).Retrieved May 15, 2013, from http://en.wikipedia.org/wiki/SarcodesTopographic Map of the Eagle Falls Trail, Lake Tahoe, California.(n.d.). Retrieved fromhttp://www.americansouthwest.net/california/lake_tahoe/eagle-falls-trail-map.htmlWikipedia, the free encyclopedia. (n.d.). Retrieved June 18, 2013,from http://en.wikipedia.org/

×