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Biostratigraphy, lithofacies and paleoenvironments of the Gulf 718-1 well, U.S. mid-Atlantic outer continental shelf
I 110
D. Submarine Geology and Geophysics
OLR (1990) 37 (12)
(~400 yr) deglaeiation of Hudson Bay. Atlantic Geosci. Ctr., Bedford Inst. of Oceanogr., Box 1006, Dartmouth, NS B2Y 4A2, Canada.
D180. Paleontology OCEANOGRAPHY)
90:7078 Kunin, N.Ya. et al., 1990. Regional selsmostratigraphy of the sedimentary section beneath the Barents Sea. Int. Geol. Rev., 32(!):34-46.
90:7082 Bakken, Knut, 1990. A new stratigraphically important spore assigned to the genus Rogalskaispodtes Danz6-Corsin and Laveine (1963) from the Late Triassic of the Barents Sea. Rev. Palaeobot. Palynol, 63(1-2):153-162. Statoil a.s., P.O. Box 300 Forus, N-4001 Stavanger, Norway.
The methods used for a regional seismostratigraphic analysis of common-depth point-seismic surveys and related data on sedimentary basins in the Barents Sea are summarized. It is concluded that the Precambrian-Cretaceous section includes 'five structural lithologic levels of ten quasisynchronous seismic sedimentary complexes' and that the basin centers are considered good prospects for the occurrence of petroleum. (hbf) 90:7079 Poppe, L.J. et al., 1990. Biostratigraphy, lithofacies and paleoenvironments of the Gulf 718-I well, U.S. told-Atlantic outer continental shelf. Mar. Geol, 92(1-2):27-50. USGS, Woods Hole, MA 02543, USA.
90:7080 Radtke, Ulrich and Rainer Gran, 1990. Revised reconstruction of Middle and Late Pleistocene sea-level changes based on new chronologic and morphoiogic investigations in Barbados, West Indies. J. coast. Res, 6(3):699-708. Geograph. Inst., Heinrich Heine Univ. Dusseldorf, Universitatsstr. 1, D-4000 Dusseldorf 1, FRG. 90:7081 Raymo, M.E. et al., 1990. Evolution of AtlanticPacific 813C gradients over the last 2.5 m.y. Earth planet. Sci. Letts, 97(3-4):353-368.
Interocean carbon isotopic gradients over the last 2.5 m.y. are examined using high-resolution 813C records from Atlantic and Pacific deep-sea cores. Reductions in North Atlantic Deep Water (NADW) production occur during ice maxima. From 2.5 to 1.5 Ma, glacial reductions in N A D W are less than in the Late Pleistocene. Atlantic/Pacific ~3C values converge during glaciations between 1.13-1.05, 0.830.70, and 0.46-OA3 m.y. with a pseudo-periodicity of ~ 3 0 0 kyr, not easily ascribed to glacial ice volume or orbital forcing. A partial decoupling at low frequencies of 8~80 and ~3C signals at a North Atlantic site, indicates that variations in N A D W circulation cannot be viewed simply as a linear response to ice sheet forcing. Dept. of Geol., Melbourne Univ., Parkville, Vie. 3052, Australia.
(see also E-BIOLOGICAL
90:7083 Culver, S.J., 1990. Benthic Foraminifera of Puerto Rican mangrove-lagoon systems: potential for paleoenvironmental interpretations. Palaios, 5(!):34-51.
Recent foraminiferal assemblages from four traverses across mangrove-lagoonal environments off Puerto Rico exhibit distribution patterns that should be useful in paleoenvironmental interpretations. Variations in sediment substrate, abundance and distribution of marine vegetation, and exposure to wave and current activity are important factors for foraminifer distributions and abundances. Four major assemblages identified by cluster analysis of abundance data and other generally recognizable trends provide a micropaleontologicai link between a potential petroleum source, mangrove swamps, and the potential petroleum reservoir, the reef rocks. Dept. of Geol. Sci., Old Dominion Univ., Norfolk, VA 23529-0496, USA. 90:7084 Duane, Ailbhe and Rex Harland, 1990. Late Quaternary dinoflagellate cyst blostratigraphy for sediments of the Porcupine Basin, offshore western Ireland. Rev. Palaeobot. Palynol, 63(12):1-11. Dept. of Geol. Sci., Polytechnic South West, Drake Circus, Plymouth PL4 8AA, UK. 90:7085 Thackeray, J.F., 1990. Rates of extinction in marine invertebrates: further comparison between background and mass extinctions. Paleobiology, 16(1):22-24.
Prominent extinction 'events' have been recognized from statistical analyses of marine invertebrate genera represented in Mesozoic and Cenozoic assemblages, contrasting with relatively low 'background' extinction intensities measured in terms of a 'percentage extinction' index. This study suggests that the magnitude of the factor(s) primarily associated with most mass extinctions in a 260-m.y. period need not necessarily have been very different from one event to another, an exception being the mass extinction at the end of the Cretaceous. Dept.
D. Submarine Geology and Geophysics
OLR (1990) 37 (12)
(~400 yr) deglaeiation of Hudson Bay. Atlantic Geosci. Ctr., Bedford Inst. of Oceanogr., Box 1006, Dartmouth, NS B2Y 4A2, Canada.
D180. Paleontology OCEANOGRAPHY)
90:7078 Kunin, N.Ya. et al., 1990. Regional selsmostratigraphy of the sedimentary section beneath the Barents Sea. Int. Geol. Rev., 32(!):34-46.
90:7082 Bakken, Knut, 1990. A new stratigraphically important spore assigned to the genus Rogalskaispodtes Danz6-Corsin and Laveine (1963) from the Late Triassic of the Barents Sea. Rev. Palaeobot. Palynol, 63(1-2):153-162. Statoil a.s., P.O. Box 300 Forus, N-4001 Stavanger, Norway.
The methods used for a regional seismostratigraphic analysis of common-depth point-seismic surveys and related data on sedimentary basins in the Barents Sea are summarized. It is concluded that the Precambrian-Cretaceous section includes 'five structural lithologic levels of ten quasisynchronous seismic sedimentary complexes' and that the basin centers are considered good prospects for the occurrence of petroleum. (hbf) 90:7079 Poppe, L.J. et al., 1990. Biostratigraphy, lithofacies and paleoenvironments of the Gulf 718-I well, U.S. told-Atlantic outer continental shelf. Mar. Geol, 92(1-2):27-50. USGS, Woods Hole, MA 02543, USA.
90:7080 Radtke, Ulrich and Rainer Gran, 1990. Revised reconstruction of Middle and Late Pleistocene sea-level changes based on new chronologic and morphoiogic investigations in Barbados, West Indies. J. coast. Res, 6(3):699-708. Geograph. Inst., Heinrich Heine Univ. Dusseldorf, Universitatsstr. 1, D-4000 Dusseldorf 1, FRG. 90:7081 Raymo, M.E. et al., 1990. Evolution of AtlanticPacific 813C gradients over the last 2.5 m.y. Earth planet. Sci. Letts, 97(3-4):353-368.
Interocean carbon isotopic gradients over the last 2.5 m.y. are examined using high-resolution 813C records from Atlantic and Pacific deep-sea cores. Reductions in North Atlantic Deep Water (NADW) production occur during ice maxima. From 2.5 to 1.5 Ma, glacial reductions in N A D W are less than in the Late Pleistocene. Atlantic/Pacific ~3C values converge during glaciations between 1.13-1.05, 0.830.70, and 0.46-OA3 m.y. with a pseudo-periodicity of ~ 3 0 0 kyr, not easily ascribed to glacial ice volume or orbital forcing. A partial decoupling at low frequencies of 8~80 and ~3C signals at a North Atlantic site, indicates that variations in N A D W circulation cannot be viewed simply as a linear response to ice sheet forcing. Dept. of Geol., Melbourne Univ., Parkville, Vie. 3052, Australia.
(see also E-BIOLOGICAL
90:7083 Culver, S.J., 1990. Benthic Foraminifera of Puerto Rican mangrove-lagoon systems: potential for paleoenvironmental interpretations. Palaios, 5(!):34-51.
Recent foraminiferal assemblages from four traverses across mangrove-lagoonal environments off Puerto Rico exhibit distribution patterns that should be useful in paleoenvironmental interpretations. Variations in sediment substrate, abundance and distribution of marine vegetation, and exposure to wave and current activity are important factors for foraminifer distributions and abundances. Four major assemblages identified by cluster analysis of abundance data and other generally recognizable trends provide a micropaleontologicai link between a potential petroleum source, mangrove swamps, and the potential petroleum reservoir, the reef rocks. Dept. of Geol. Sci., Old Dominion Univ., Norfolk, VA 23529-0496, USA. 90:7084 Duane, Ailbhe and Rex Harland, 1990. Late Quaternary dinoflagellate cyst blostratigraphy for sediments of the Porcupine Basin, offshore western Ireland. Rev. Palaeobot. Palynol, 63(12):1-11. Dept. of Geol. Sci., Polytechnic South West, Drake Circus, Plymouth PL4 8AA, UK. 90:7085 Thackeray, J.F., 1990. Rates of extinction in marine invertebrates: further comparison between background and mass extinctions. Paleobiology, 16(1):22-24.
Prominent extinction 'events' have been recognized from statistical analyses of marine invertebrate genera represented in Mesozoic and Cenozoic assemblages, contrasting with relatively low 'background' extinction intensities measured in terms of a 'percentage extinction' index. This study suggests that the magnitude of the factor(s) primarily associated with most mass extinctions in a 260-m.y. period need not necessarily have been very different from one event to another, an exception being the mass extinction at the end of the Cretaceous. Dept.