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• W1245643704 abstract "Upper Cretaceous rocks of southwestern Wyoming, identified as Mesaverde Formation, Mesaverde Groups; or Adaville Formation; and the Echo Canyon Conglomerate of northeastern Utah, outcrop in linear belts around uplifted areas. Many facies changes occur as a result of marine transgressions and regressions and make correlations difficult. The natural remanent magnetism of most rocks often represents a record of the earth’s past magnetic history and can be used for the corre­ lation of rock units, when stability is demonstrated. Four stratigraphic sections or representative outcrops of the Mesaverde Formation or Group of southwestern Wyoming and northeastern Utah were measured and rock cores were collected. A total of 3,44? meters of section was measured and 261 oriented rock cores were taken from the four sites. The natural remanent magnetism of 471 specimens was measured. Thermal demagnetization studies were performed in order to determine the stability and type of magnetization present. Complete thermal demagnetization of representative specimens by steps has indicated a viscous magnetization as the type present. All magnetization was lost at a temperature of 300° C. and was thermally distributed. An artificial viscous partial thermo-remanence was created by heating representative specimens to a temperature of 300° c. and cooling in the earth’s magnetic field. The demagnetiza­ tion of these specimens by stages was similar to that of the NEM x x± demagnetization. The conclusion was made that the type of magnetiza­ tion present is a viscous partial thermo-remanence. Hie mean direction of a suite of specimens did not change when demagnetized by stages to 200° 0., but the scatter of the individual specimen directions about the mean was reduced. Hms, the mean direction of the HEM for a set of specimens from a stratigraphic unit appeared stable and representative of the paleo-directions at the time the rocks were deposited. Correlation of the four sections was accomplished by estab­ lishing a paleomagnetic datum or marker zone, present in three of the sections studied. Hiis marker zone represents a field reversal, since magnetic directions from it give a pole position in the southern hemisphere. The fourth section was correlated to the other three by means of a second zone of reversal below the first. Seven paleo­ magnetic correlation units were established in all. The mean declinations and inclinations from the four sites and the seven paleomagnetic intervals were used to calculate a paleomagnetic pole position. The pole position so calculated is Latitude 70° North, Longitude 177° East, Alpha(95) 13.4 degrees. This pole position is not significantly different from those previously reported in the literature for the Cretaceous Period. Three of the poles previously reported for the Cretaceous of North America are from igneous rocks and one is from sedimentary rocks. There is no significant difference for the pole position calculated here from sedimentary rocks and that from igneous rocks, since the circles of confidence or ovals of confidence overlap. xii" @default.
• W1245643704 created "2016-06-24" @default.
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• W1245643704 date "1967-01-01" @default.
• W1245643704 modified "2023-09-26" @default.
• W1245643704 title "Remanent magnetic properties of the Mesa-Verde group, southwestern Wyoming and northeastern Utah" @default.
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• W1245643704 hasPublicationYear "1967" @default.
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