Lab fieldevelinajonsson


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  • Lab fieldevelinajonsson

    1. 1. LAB/FIELDASSIGNMENT Evelina Jonsson Geology
    2. 2. American River/Folsom LakeThis river runs from the SierraNevada mountain range.It runs through Sacramentowhere it meets the SacramentoRiver and hits San FranciscoBay.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 volcanic islands(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 an intrusiveigneous rockIts 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. Oak TreeOaks (Quercus spp.), members of the Beechfamily (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, oakshave played an important role in temperatelandscapes. Of the 500 species in the genusQuercus, approximately 90 are found in theUnited States and Canada, with another 112species in Mexico. Another member of the Beechfamily that is closely related to the oaks is thetanoak (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) andbears acorns like the oaks, thus making it apossible evolutionary link between the twogenera. (
    9. 9. RattlesnakeCalifornia rattlesnake species include thenorthern Pacific rattlesnake (in northernCalifornia), and the Western Diamondback,Sidewinder, Speckled rattlesnake, Red Diamondrattlesnake, Southern Pacific, Great Basinrattlesnake and the Mojave rattlesnake (all foundin Southern California). ( from sea level to the inland prairies anddesert areas and to the mountains at elevations ofmore than 10,000 feet. ( venomous snake.( not aggressive, rattlesnakes strike whenthreatened or deliberately provoked, but givenroom 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 Snake wasin the middle of the path and struck at me. Luckily, Ireacted fast enough and jumped away and it ran away too!
    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 of distinctfeatures in the structure of their skull; both, forinstance, possess a moveable quadrate bone at the backof the jaw, and both are missing the quadratojugal boneat the rear of the skull. (Flank)One of the earliest snakes to appear in the fossil recordhas been given the scientific name Lapparentophisdefrenni. It was found in the Saharan Desert and hasbeen dated to the early Cretaceous period, about 130million years ago. (Flank)
    12. 12. References