450 D. Submarine Geology and Geophysics OLR (1983) 30 (6)

83:3319 Marchig, V., H. Gundlach, P. MOiler and F. Schley,

1982. Some geochemical indicators for discrim- ination between diagenetic and hydrothermal metalliferous sediments. Mar. Geol., 50(3):241- 256.

Possible indicators are differences in P/Y and Cr/Zr correlations; REE distribution patterns; and As contents (at present the most suitable criterion). Bundesanstalt fur Geowiss. und Rohstoffe, Han- nover, FRG.

83:3320 Morton, A.C., 1982. Lower Tertiary sand devel-

opment in Viking Grahen, North Sea. Am. Ass. Petrol. Geol. Bull., 66(10):1542-1559. Inst. of Geol. Sci., Ring Road Halton, Leeds LS15 8TQ, UK.

83:3321 Popov, V.P. and V.N. Sval'nov, 1982. Indicator

minerals of the sedimentary provinces of the northern Indian Ocean. Int. Geol. Rev., 24(11): 1253-1257. (Russian original.)

Data indicate the existence of 10 sedimentary provinces in the Late Quaternary sediments of the northern Indian Ocean. The mineral assemblages also reflect the presence of various bottom features. Zoning in the distribution of sand-silt mineral fractions correlates with distance from land-based sources of detritus. S. Ordzhonikidze Inst. of Geol., Moscow, USSR. (hbf)

83:3322 Ronov, A.B., 1982. The Earth's sedimentary shell

(quantitative patterns of its structure, composi- tions, and evolution). I. The 20th V.I. Vernadskiy Lecture, March 12, 1978. Int. Geol. Rev., 24(11): 1313-1363. (Russian original.)

Recent Soviet work on the 'stratisphere' (stratified and volcanic sequences) is described. In the tradition of V.I. Vernadskiy, the goal of this work is to construct global models of the stratisphere through time which describe the chemical and tectonic interactions of the stratisphere with the crust and mantle below, and the ocean, atmosphere, and life forms above. Vernadskiy Inst. of Geochem. and Analyt. Chem., Acad. of Sci., USSR. (fcs)

83:3323 Stow, D.A.V., 1982. Bottom currents and contourites

in the North Atlantic. Bull. Inst. G~ol. Bassin Aquitaine, 31/32:151-166.

Studies reveal that bottom currents have had a major effect on sediment nature and distribution, that they

vary greatly in time and space, and that it is difficult to distinguish between effects of bottom and other currents on the sediment surface. Muddy and sandy contourites have been described but sedimentary criteria alone are not sufficiently definitive to identify contourites with confidence. Grant Inst. of Geol., Univ. of Edinburgh, West Mains Rd., Ed- inburgh EH9 3JW, UK. (mwf)

83:3324 Tanner, P.W.G. and D.I.M. Macdonald, 1982.

Models for the deposition and simple shear deformation of a turbidite sequence in the South Georgia [South Atlantic] portion of the southern Andes back-arc basin. J. geol. Soc., Lond., 139(6):73%754.

New field data on the Cumberland Bay Formation, an Upper Jurassic-Lower Cretaceous andesitic turbi- dite sequence derived from the southern Andes volcanic arc, suggest sedimentation resembling that of linear, tectonically-controlled troughs. Folding accompanying the mid-Cretaceous closure of the basin shortened the turbidites by as much as 55%; deformation geometry is consistent with under- thrusting or subduction of the basin floor beneath the arc. Dept. of Geol., Univ. of Glasgow, Glasgow GI2 8QQ, UK. (hbf)

83:3325 Wang, Ying, D.J.W. Piper and Gustavs Vilks, 1982.

Surface textures of turbidite sand grains, Lau- rentian Fan and Sohm Abyssal Plain. Sedimen- tology, 29(5):727-736.

Quartz grains from 5 samples representing various distances of turbidity current transport exhibit glacially-derived surface textures preserved in de- pressions, as well as rounding and collision-induced markings. Resedimented shelf Foraminifera trans- ported in suspension are found in association with the mid-Wisconsin (or earlier) grains, which show the most intense current effects and have been transported ~1000 km to the Sohm Abyssal Plain. Mar. Geomorph. Lab., Nanking Univ., Nanking, People's Republic of China. (hbf)

D170. Historical geology, stratigraphy 83:3326

Barron, E.J. and W.M. Washington, 1982. Atmos- pheric circulation during warm geologic periods: is the equator-to-pele surface-temperature gra- dient the controlling factor? Geology, geol. Soc. Am., 10(12):633-636.

OLR (1983) 30 (6) D. Submarine Geology and Geophysics 451

Numerical experiments are used to examine the effect of the equator-to-pole surface temperature gradient and geography on Cretaceous atmospheric paleocirculation. There is, in these model results, no strong decrease of circulation due to reduced temperature gradient; however, there is evidence for strong geographic control. Results raise questions about the two classical paleoclimate hypotheses: i.e., during 'warm' periods, surface currents and winds were 'sluggish' and large-scale features (e.g., the westerlies) were displaced poleward. Paleoclimatic Stud. Prog., NCAR, Boulder, Colo. 80307, USA. (if P)

83:3327 Barron, E.J. and W.M. Washington, 1982. Creta-

ceous climate: a comparison of atmospheric simulations with the geologic record. Palaeogeogr. Palaeoclimatol. Palaeoecol., 40(1/3): 103-133.

Simulated Cretaceous atmospheric circulations dif- fer from the present-day pattern and do not support the classical hypothesis of 'weaker circulation and poleward displacement of circulation features.' A comparison of simulations utilizing Cretaceous geography and temperatures to modelled present- day conditions suggests 'that paleogeography is an important factor governing...the circulation.' Paleo- climatic Stud. Prog., NCAR, Boulder, Colo. 80307, USA. (msg)

83:3328 Barron, E.J. (ed.), 1981/82. Paleogeography and

dlmate. Meeting, Cincinnati, 1981. Special issue. Palaeogeogr. Palaeoclimatol. Palaeoecol., 40(1/3):1-253; 11 papers.

GSA's annual meeting dealt primarily with the relationships between paleogeographic factors and climate. Papers addressed the climates of specific geological time intervals (Archean, Late Triassic, Cretaceous); Mesozoic and Cenozoic atmospheric circulation and rainfall models; anoxia in the deep-sea environment; the paleogeography and circulation of the Arctic Basin; the influence of the North Atlantic on deep oceanic circulation; and the deglacial build-up of CO2. (hbf)

83:3329 Berger, W.H., 1982. Deglaelal CO z buildup: con-

stralnts on the coral-reef model. Palaeogeogr. PalaeoclimatoL PalaeoecoL, 40(1/3):235-253.

The transgressive coral-reef model, aided by the Worthington Effect, accounts for about half of the deglacial atmospheric CO2 increase and explains the Holocene dissolution pulse. Decreased oceanic fertility should account for the missing CO 2. Scripps

Inst. of Oceanogra., La Jolla, Calif. 92093, USA. (msg)

83:3330 Broecker, W.S., 1982. Glacial to interglacial changes

in ocean chemistry. Prog. Oceanogr., 11(2):151- 197.

If atmospheric CO2 content is substantially higher at present than during the last glacial period, as suggested by tantalizing evidence from polar ice cores, then the change must have been induced by a change in oceanic chemistry, suggested here to have been higher PO 4 concentrations responsible for reduced CO 2 partial pressure in the glacial ocean. Post-glacial PO 4 absorption by increased volumes of organic-rich shelf sediments is believed responsible for subsequent reversal of the process. Includes appendixes on the CaCO3/Corg rain rate ratio, the 8J3C-PO4 relationship, and the C/P ratio in organic debris being oxidized in the deep sea. Lamont- Doherty Geol. Observ., Palisades, N.Y. 10964, USA. (fcs)

83:3331 Burckle, L.H., L.D. Keigwin and N.D. Opdyke,

1982. Middle and Late Miocene stable Isotope stratigraphy: correlation to the paleomagnetic reversal record. Mieropaleontology, 28(4):329- 334.

Late Miocene oxygen isotope stratigraphy for DSDP Site 158 (eastern equatorial Pacific) reveals two oxygen isotope events reflecting growth of the East Antarctic Ice Sheet; they are correlated to the lower parts of Magnetic Epochs 11 and 10 (~11 and 10 Ma, respectively). Lamont-Doherty Grol. Observ., Palisades, NY 10964, USA.

83:3332 Crittenden, S., 1982. Lower Cretaceous lithostratig-

raphy NE of the sole pit area in the U.K. southern North Sea. J. Petrol. Geol., 5(2):191-201. Dept. of Geol., Plymouth Polytechnic, Drake Circus, Plymouth, Devon PL4 8AA, UK.

83:3333 Dansgaard, W. et al., 1982. A new Greenland deep ice

core. Science, 218(4579): 1273-1277.

A new ice core from south Greenland presents a continuous sequence of data on atmospheric con- ditions back to ~90,000 yrBP, based on compar- isons with the oxygen isotopic profile of the northwest Greenland Camp Century core and the deep-sea foraminiferal record. An abrupt, dramatic termination of the Eem/Sangamon interglacial is