Cross beds can be used to determine paleocurrent directions. Such information is

Question

Cross beds can be used to determine paleocurrent directions. Such information is of great value in regional stratigraphic study. Often, however, cross beds are not 9. fully exposed, and their true attitude must be calculated from data on apparent dip. Consider a cross bed in sandstone that is exposed on two vertical nonparallel joint faces. On one face the apparent dip of the cross bed is 10o,016°, whereas on the other it is 28 082 (a) What is the attitude of the cross bed? (b) Assume that the current direction is parallel to the true dip direction of the cross bed. What was the orientation of the current direction during deposition of the sandstone? (c) What is the orientation of a joint face on which the apparent dip of the cross bed is the maximum possible value?

Explanation / Answer

(a). The attitude of cross bed may be possible in both directions as per given in problem i.e 10, 016, & 28, 082.

(b). True Dip Direction : The maximum inclination of strata from horizontal is called true dip in direction of dip or perpendicular of strike direction.

      The orientation of current direction is towards east or towards west direction.

(c). The orientation of joint face on which the apparent dip of the cross bed is the maximum possible value28, 082

     

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