Introduction To The Brunton Compass - University Of Texas .
Introduction to the Brunton CompassGeo420k, Lab 1M. Helper, Jackson School of Geosciences, UT Austin
Parts of the Brunton CompassMirrorLift Pin forNeedleNeedleCompassCardBull’s EyeLevelSighting ArmImage from: tmM. Helper, Jackson School of Geosciences, UT AustinClinometerLevel
Parts of the Compass FaceImage from: tmM. Helper, Jackson School of Geosciences, UT Austin
Compass Mastery Locate North, Set local declination Measure Bearings Measure Strike and Dip of planes Measure Trend and Plunge of lines Measure Vertical Anglesomeasuring height / thickness of a featureM. Helper, Jackson School of Geosciences, UT Austin
Recording a BearingBearing: direction from one point to anotherNORecording notation: Azimuth: “247 ”360NWW 270NEOO90 EOO24767SEO.180S Quadrant:“S 67 W”M. Helper, Jackson School of Geosciences, UT Austin
Measuring StrikeStrike: Direction of the line of intersection between atilted plane and a horizontal planeAerial View: Strike of DippingStrataStrikeStrike(E.F. McBride)Image from: tmM. Helper, Jackson School of Geosciences, UT Austin
Measuring StrikeMeasuring a field book that defines the tilted plane of interestM. Helper, Jackson School of Geosciences, UT Austin
Measuring StrikeStrike: Direction of the line of intersection between atilted plane and a horizontal planeStrikeImages from: tm Compass must be horizontal (bull’s eye bubblecentered), with compass edge flush to the tilted planeM. Helper, Jackson School of Geosciences, UT Austin
Recording StrikeIn the picture at left, is the strike 157o or 337o?Right-hand Rule: Record the bearing in thedirection that places thedip direction of the plane tothe right (clockwise from)strike.Answer: 337oStrikeStrikeImages from: tmM. Helper, Jackson School of Geosciences, UT Austin
Measuring DipDip: The maximum slope of a plane, measured fromhorizontal. The dip direction is always perpendicular to strike.The dip direction is: The “fall line” inskiing The direction waterruns down asloping surface The direction apebble rolls down asloping surfaceWHorizontalDip Angle(E.F. McBride)M. Helper, Jackson School of Geosciences, UT AustinE
Measuring DipM. Helper, Jackson School of Geosciences, UT Austin
Measuring DipImages /sd.htm Place compass on itsside, perpendicular tostrike Level the clinometer(center the bubble) Read the dip, i.e. 36oM. Helper, Jackson School of Geosciences, UT Austin
Recording Strike & DipShorthand Notation:337/36oor337/36o NE “NE” records the dipdirection, but is redundantif the right-hand rule isfollowedImages /sd.htmM. Helper, Jackson School of Geosciences, UT Austin
Measuring the Trend of a Linear FeatureTrend: The orientation of a line, in the direction thatit is inclined.1. Point the Sighting Armof compass parallel tothe direction thefeature plunges2. Hold compass level3. Read the white end ofthe compass needleGlacial Striations (Maine)M. Helper, Jackson School of Geosciences, UT AustinM. J. Cooke
Measuring the Plunge of a Linear Feature1. Place the side ofthe compassparallel thefeature2. Measure theangle of the linefrom horizontalwith theclinometer, asdone for dipHorizontalPlungeGlacial Striations (Maine)M. Helper, Jackson School of Geosciences, UT AustinM. J. Cooke
Recording Trend and Plunge of a LineShorthand Notation:“25o/150”HorizontalReads:“plunges 25degrees toward abearing of 150o”Plunge 25oTrend 150oM. J. CookeM. Helper, Jackson School of Geosciences, UT Austin
Introduction to the Brunton Compass Geo420k, Lab 1. M. Helper, Jackson School of Geosciences, UT Austin Mirror Lift Pin for Needle Compass Card Sighting Arm Parts of the Brunton Compass . Compass must be horizontal (bull’s eye bubble centered), with compass edge flush to the tilted plane Strike.
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GEO420K Introduction To Field and Stratigraphic Methods – Lab & Lecture Manual LAB 1: USING A BRUNTON COMPASS & CONSTRUCTING A PACE AND COMPASS MAP The compass is a very important tool for the field geologist. Today's lab is designed to familiarize you with its various applications and uses. Please read: p. 16-21
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