Lab fieldevelinajonsson


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Lab fieldevelinajonsson

  1. 1. Lab/Field Assignment Evelina Jonsson Geology
  2. 2. American River/Folsom Lake LakeThis river runs from the SierraNevada mountain range.It runs through Sacramentowhere it meets theSacramento River and hitsSan Francisco Bay.The river also runs throughFolsom beneath the FolsomLake.
  3. 3. Metamophic RocksRattlesnake bar near FolsomLakeMetamorphic rocks are rockssubjected to sufficient heat,pressure and fluid activity tochange their mineralcomposition texture or both.(The Changing Earth, pg.182)
  4. 4. Metamorphic RocksMetamorphic rocks, known as the Copper HillVolcanics, occur east of Rattlesnake Bar, Theserocks represent ancient chains of volcanicislands (island arcs) and the associated seafloorsediments that have since been buried, squeezed,and heated to form metasedimentary andmetavolcanic rocks. During the Jurassic period,from about 160 to 140 million years ago, theisland arcs were added as the ocean plate inwhich they were embedded was subductedbeneath western North America. (
  5. 5. GraniteGranite is anintrusive igneousrockIts light coloredBlack and whiteCourse grainedContains quartz andfedspar
  6. 6. GraniteFolsom Lake contains younger graniticintrusive plutons that intruded andobliterated some of the metamorphic beltand nearly flat-lying deposits of volcanicash, debris flows, and alluvial fan depositsthat overlie the older rocks. (
  7. 7. Oak Tree Oak trees are a type of deciduous tree. These are broad-leaved trees that shed all their leaves during one season. The oak trees produce acorns once a year during the fall. A mature oak tree draws up to 50 or more gallons of water per day through its roots. Oak trees can live 200 or more years. Height up to 30 m.
  8. 8. Oaks (Quercus spp.), members of the Beech Oak Treefamily (Fagacea), are trees and shrubs havingsimple, alternate leaves found throughout theworld. Characterized by their strong, complexwood, wind-pollinated flowers, fruits calledacorns, and their ability to live for centuries,oaks have played an important role intemperate landscapes. Of the 500 species inthe genus Quercus, approximately 90 are foundin the United States and Canada, with another112 species in Mexico. Another member of theBeech family that is closely related to the oaksis the tanoak (L. densiflorus), which is found inCalifornia and is the only representative of thisAsian genus found in North America. It hasflowers similar to the chinkapin (Castanopsis)and bears acorns like the oaks, thus making it apossible evolutionary link between the twogenera. ( more:Oaks - Evolution, Biology And Ecology, Diseases, Distributio
  9. 9. RattlesnakeCalifornia rattlesnake species include thenorthern Pacific rattlesnake (in northernCalifornia), and the Western Diamondback,Sidewinder, Speckled rattlesnake, RedDiamond rattlesnake, Southern Pacific, GreatBasin rattlesnake and the Mojave rattlesnake(all found in Southern California). ( from sea level to the inland prairies anddesert areas and to the mountains at elevationsof more than 10,000 feet. ( venomous snake.( not aggressive, rattlesnakes strikewhen threatened or deliberately provoked, butgiven room they will retreat. ( shaking of their tail (rattle shaking) is awarning sign.
  10. 10. California King SnakePrey on rattlesnakes and have become immune to theirvenom. They can also mimic the rattlesnakes rattle tointimidate other rattlesnakes.Generally not aggressive.Found in parts of North America and Mexico.Powerful constrictor.Normally about 48 inches long.Few weeks ago I was walking on a trail near the FolsomLake around dusk and a 3ft long California King Snakewas in the middle of the path and struck at me. Luckily, Ireacted fast enough and jumped away and it ran awaytoo!
  11. 11. Scientists have concluded that the snakes probablyevolved from a family of lizards during the time of thedinosaurs. Snakes and lizards share a number ofdistinct features in the structure of their skull; both, forinstance, possess a moveable quadrate bone at theback of the jaw, and both are missing thequadratojugal bone at the rear of the skull. (Flank)One of the earliest snakes to appear in the fossilrecord has been given the scientific nameLapparentophis defrenni. It was found in the SaharanDesert and has been dated to the early Cretaceousperiod, about 130 million years ago. (Flank)
  12. 12. ReferencesFlank, Lenny. "Evolution of Snakes." N.p., 12 Feb. 2007. Web. 22 July 2012."Geology and Soils." N.p., n.d. Web. 22 July 2012."Interesting Facts about Oak Trees." N.p., 13 Nov. 2000. Web. 22 July 2012."Rattlesnakes in California." N.p., n.d. Web. 22 July N.p., 2012. Web. 22 July 2012.