OLR(1980)27(12) C. Submarine Geology and Geophysics 863

sedim. Petrology, 50(2): 622-623. Department of Earth Sciences, Fort Hays State University, Hays, Kans. 67601, U.S.A.

80:5882 Prezbindowski, Dennis, 1980. Microsampling

technique for stable isotopic analyses of car- bonates. J. sedim. Petrology, 50(2): 643-644.

A miniature vertical milling machine can be used to routinely obtain microsamples of sedimentary rock components. Amoco Production Company, Research Center, P.O. Box 591, Tulsa, Okla. 74102, U.S.A.

80:5883 Syvitski, J. P. M. and Peter Bayliss, 1980. Clay

mineral X-ray diffraction analysis: Ag filter-pipette methods [applied to Howe Sound, Br i t i sh Columbia , suspended sediments]. J. sedim. Petrology, 50(2): 624- 626. Department of Geology and Geophysics, University of Calgary, Alberta, T2N 1N4, Canada.

3. Bathymetry and general geology 80:5884

Anon, 1980. [Offshore southern California map.] Offshore, 40(6): 105-106.

This colorful wall-size map of the coastal waters off the U.S. west coast is a valuable resource tool in- cluding federal leases and blocks off California.

80:5885 Spiridonov, M. A. et al., 1980. Geology of the

White Sea. (In Russian.) Soy. Geol., 1980(4): 45-55.

80:5886 Sviridov, N. I., 1980. Physical properties of

bedrocks and sediments of the Baltic Sea floor. (In Russian.) Soy. Geol., 1980(3): 110- 115.

4. Subsurface s tructure of the ocean bottom based chiefly on geophysical methods

petroleum company and German and American in- stitution data) were used to generate structure, isopach and potential field maps for the Scott Plateau and adjacent Argo Abyssal Plain. Four major reflectors, identified as Late Jurassic, intra- Upper Cretaceous, base of Tertiary and Oligocene, were mapped. Interval velocities were used for time to depth conversion so that structure and isopach maps were generated in time and depth. The 23 plates in pocket cover bathymetry; free air, Bouguer and magnetic anomalies; Oligocene, base Tertiary and Upper Cretaceous structure; break- up unconformities; and carbonate, break-up sedi- ment and paleo-isopachs. (kink)

5. Gravity, geodesy and magnet i sm

80:5888 Angevine, C. L. and D. L. Turcotte, 1980. On the

compensation mechanism of the Walvis Ridge. Geophys. Res. Letts, 7(4):477-479.

Two methods of determining mechanisms of com- pensation, the geoid-bathymetry and the cross- spectral gravity-topography methods, are com- pared at the Walvis Ridge. Geoid anomalies, deter- mined using GEOS 3 satellite data, correlate with broad topographic features amociated with the ridge. This correlation is best explained by Pratt compensation at a depth of 20-30 kin. Department of Geological Sciences, Cornell University, Ithaca, N.Y. 14853, U.S.A. (kink)

80:5889 Lovlie, R. and H. Holtedahl, 1980. Apparent

palaeomagnetic Iow-inclinatlon excursion in a pre-consolidated continental shelf sedi- ment. Phys. Earth planet. Interiors, 22(2): 137-143.

Slumping is found to be the probable cause of an almost 180 ° change in declination apparent in a core from the west coast of Norway. Comparison of homogeneity of magnetic and other sediment properties above and below the excursion in the core suggests different depositional environments. Other low inclination excursions detected in sediments might be explained by similar sedimen- tary processes. Department of Geophysics, Univer- sity of Bergen, N-5014 Bergen, Norway. (bas)

80:5887 Stagg, H. M. J., 1.977. Scott Plateau: structure,

isopach, and potential field maps. Aust. Dep. Miner. Energy, Geol. Geophys. Rec., 43:14 pp.

Geophysical data (6100 km acquired by the Bureau of Mineral Resources, supplemented by 6800 km of

6. Heat in the ocean bottom

80:5890 Zlotnicki, V., J. G. Sclater, I. O. Norton and R. P.

Von Herzen, 1980. Heat flow through the floor of the Scotia, far South Atlantic and