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L15_Review - and the nose of a syncline points AWAY from...

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4/18/2011 1 Geologic History Review EVENTS _______ _______ _______ _______ _______ _______ _______ Oldest REVIEW STRUCTURE Strike and Dip Strike has Two Directions // to rock layer contacts. Dip has One Direction and an Angle. Strike and Dip can be identified on both the rock formations and the fault. SOURCE: http://www.geoclassroom.com/structure/simplelab.shtml
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4/18/2011 2 REVIEW STRUCTURE Anticlines and Synclines Due to Compression Convergent Plate Boundaries Anticline Convex up Syncline Concave up SOURCE: http://www.uwsp.edu/geo/faculty/lemke/geog101/lectures/20 _folded_&_faulted_landforms.html REVIEW STRUCUTRE Rules for Interpreting Folds Superpostion in undeformed sedimentary rocks the youngest layer will be on top. THEREFORE in deformed sedimentary rocks the formations are inlcined (DIP) towards the youngest layers. Older rocks are exposed at the center of an anticline and younger rocks are exposed at the center of a syncline . In plunging folds the nose of the anticline points in the direction of plunge
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Unformatted text preview: and the nose of a syncline points AWAY from the direction of plunge . 4/18/2011 3 Plunging Anticline 4/18/2011 4 REVIEW – STRUCTURE Normal Faults • HW moves down w/respect to FW • Extension • Horsts and Grabens REVIEW – STRUCTURE Reverse Faults • HW Moves up w/respect to FW • Compression • Thrust Fault = low angle Reverse Fault 4/18/2011 5 REVIEW – STRUCTURE Strike-Slip Faults • Shear Stress • Right Lateral vs. Left Lateral SOURCE: http://crack.seismo.unr.edu/ftp/ftp/web/ep/nvguide/sbg1.html REVIEW – STRUCTURE Rules for Interpreting Faults • The upthrown side of a fault will be eroded to the level of the downthrown side • In horizontal rock layers – older formations will be at the surface on the upthrown side • In tilted rock layers - as the upthrown side is eroded the contact lines shift in the direction of dip. 4/18/2011 6 GEOLOGIC KEY P P M D S O O O S S D D GEOLOGIC KEY P P M D S O O O S S D D...
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