Changes

[[file:core-orientation_fig3.png|thumb|300px|{{figure number|3}}Paleomagnetic plug sample.]]

[[file:core-orientation_fig3.png|thumb|300px|{{figure number|3}}Paleomagnetic plug sample.]]

Core-based techniques rely at least in part on data derived from the core for orientation. If bedding planes and fractures can be discerned in the core, it may be possible to use dipmeter logs or data from borehole televiewers to determine the orientation of the core (see “[[Dipmeters]]” and “[[Borehole imaging devices]]”). Another approach to core-based orientation involves analysis of naturally existing paleomagnetic signals in rock to determine their relationship to present-day geographic north.

Core-based techniques rely at least in part on data derived from the core for orientation. If bedding planes and fractures can be discerned in the core, it may be possible to use [[dipmeter]] logs or data from [[Borehole imaging devices|borehole televiewers]] to determine the orientation of the core. Another approach to core-based orientation involves analysis of naturally existing paleomagnetic signals in rock to determine their relationship to present-day geographic north.

===Paleomagnetic core orientation===

===Paleomagnetic core orientation===