SO461, Geological Oceanography

Quiz 1a, Fall 2008

(8 pts)  Fill in the table below to create a geologic time scale.  Put the age at each location requested:

 Base= Base= Base= Base= Base= Base=

(4) Plot the following two planes using tracing paper on the stereonet on the last page of the quiz:

• N55E, 25NW
• N20W,80E

(2) Do the two planes intersect? If so, mark the intersection on the stereonet and determine the orientation in space of the intersection.

 Plane 1: N55E 25NW Plane 2: N20W 80E Intersection dips: 23.7 toward 344.4

(3)   (The grid below is every 15 degrees.)

oWhich of the three great circles below has the smallest dip?   All are equal

oWhich (if any) of the great circles dips to the SE? The one with a N45E strike (and maybe one with N5E strike)

oDo the three planes share any characteristics?  If so, quantify your answer.

Three planes and one line are plotted on the stereonet below.  The line represents the pole to one of the three planes.  Which plane is that, and what is the approximate dip and strike of the plane represented by the great circle?

N50 E, dip 45 NW

SO461, Geological Oceanography

Quiz 1b, Fall 2008

(8 pts)  Fill in the table below to create a geologic time scale.  Put the age at each location requested:

 Base= Base= Base= Base= Base= Base=

(4) Plot the following two planes using tracing paper on the stereonet on the last page of the quiz:

• N55W, 25SW
• N20E,80W

(2) Do the two planes intersect? If so, mark the intersection on the stereonet and determine the orientation in space of the intersection.

 Plane 1: N55W 25SW Plane 2: N20E 80W Intersection dips: 24.6 toward 204.6

(3)   (The grid below is every 15 degrees.)

oWhich of the three great circles below has the smallest dip?  All are equal

oWhich (if any) of the great circles dips to the NW? The one with a N30E strike

oDo the three planes share any characteristics?  If so, quantify your answer. All have the same dip

Three planes and one line are plotted on the stereonet below.  The line represents the pole to one of the three planes.  Which plane is that, and what is the approximate dip and strike of the plane represented by that great circle?

N30 E, dip 75 NW