... Pendanus candelabrum, known locally as Pamaya , first recognized in 1978 in the artisanal diamond diggings as an exotic plant, is now also confirmed as being diagnostic of coarsely brecciated kimberlite pipe eluvium. Extensive coverage of northwestern Liberia by road, foot, and air shows that Pandanus...

...G. BRENT DALRYMPLE; C. SHERMAN GROMMÉ; RICHARD W. WHITE Abstract Tholeiitic diabase dikes that trend northwest-southeast, parallel to the coastline, are common in northwestern Liberia. K-Ar whole-rock and mineral ages determined from dikes that intrude Precambrian crystalline rocks are discordant...

...Fig. 4 —Interpreted seismic-reflection profiles for northwestern sector of Liberian continental margin. Notice buried discordant reflectors beneath slope (points Y ), slump(?) scars (points X ), antithetic faults (points Z ), and gullying of slope. Above each profile is total magnetic...

... Association of Petroleum Geologists This investigation concerns the structural framework of the northwest-southeast-trending continental shelf and slope off southwestern Sierra Leone and northwestern Liberia ( Fig. 1 ). The area, about 450 km long and 50 km wide, contains a narrow and smooth shelf...

...John C. Behrendt; Cletus S. Wotorson Abstract A 140,000 km aeromagnetic and total-count gamma radiometric survey was made over Liberia in 1967-68 along north-south lines spaced 0.8 km over land and 4 km over the continental shelf. The data approximately delineate the boundary between the Liberian...

... Dulces caldera. This collapse caldera was formed ca. 1.43 Ma in the northwestern sector of the internal magmatic arc of Costa Rica as a result of the massive eruption of rhyolitic-dacitic magma that gave rise to the formation of the Liberia ignimbrite and associated deposits. The caldera collapse...

... and Trs in Costa Rica. In this article, we select two key centers in terms of population and economic significance to present hazard curves for three intensity measures (Fig.  6a ): the capital San Jose, in central Costa Rica, and Liberia—the biggest city in northwestern Costa Rica. The hazard...

...Jing Ye; Dominique Chardon; Delphine Rouby; François Guillocheau; Massimo Dall’asta; Jean-Noel Ferry; Olivier Broucke Abstract The geological evolution of northwestern Africa and its continental margins is investigated in the light of nine Meso-Cenozoic paleogeological maps, which integrate...

..., Westrans Petroleum Inc. Westrans Petroleum Inc., the sole concessionaire, carried out 7 months of photogeology, 1 month of surface geology, 1.5 months of gravity, and 1 month of magnetic surveying. By J. Z. Tomich , Ashland Exploration Co. Fig. 19 LIBERIA In August, the Ashland...

... Inf. Circ. 342. Bibliography of the Geology and Mineral Resources of Liberia and Sierra Leone, and the Adjacent Archaean Terrains of Guinea and Côte d’Ivoire, West Africa. S harad M aster . 61 p. March, 2000. Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada K1A...

.... In general, the shelf-break lies within the 80-120-fm isobath from Spanish Sahara to Liberia. 1 Manuscript received, May 24, 1971; accepted, July 31. 1971. 2 U. S. Naval Oceanographic Office. I thank E. D. Schneider and G. L. Johnson for scientific support and guidance, D. Johnson...

..., and normal marine sediments. Bordering the coast is a continental shelf that is narrower than 100 km except near the northwestern limit of the region. Depths at the shelf break average about 100 m except at the southeast, inshore of Walvis Ridge, where they are more nearly 400 m according to our measurements...

... 2700Ma) and adjacent provinces in Liberia and Sierra Leone Bull. geol. Soc. Am 1971 82 3483 90 Jones E. J. W. Mgbatogu D. Jurassic sea-floor spreading in the eastern equatorial Atlantic Nature, London 1977 267 688 90 Junner N. R. Rep. geol. Surv. Sierra Leone...

... an earthquake on March 21 at 23 h 42m05S, G.C.T., with pro- visional epicenter 241 N, 95° E, and depth of focus about 150 km. Pasadena esti- mates the magnitude as 7-7}4. This location is in northwestern Burma, near the border of Manipur, India. Verona, Italy, March 23, 1954Light earthquakes were felt...

....) Gabon Pierre Hirtz (SPAFE) Gambia British Petroleum Co. Guinea M. Tenaille and A. de Spengler (SAP) Ivory Coast M. Tenaille and A. de Spengler (SAP) Kenya Ministry of Commerce and Industry, British Petroleum Co. Liberia Director, Bureau National Resources & Surveys...

... Turkana (Rudolph) in northwestern Kenya. Figure 15 —East African rift valleys. The specially designed ship Nyanja , with its capability for multichannel recording, has made it possible to obtain better quality data in recent operations. According to Bruce Rosendahl of Duke, multichannel...

... locale map for the 22 December 1983 earthquake (star) in northwestern Guinea. Inset map shows location of area (hatchured). left homeless. The shock was felt in the adjacent countries of Guinea-Bissau, Senegal, The Gambia, Sierra Leone (U.S. Geological Survey, 1984), and over a broad area in Liberia...

.... ALLEN, Gulf (Zaire) K. S. ATTRELL, Gulf (Cameroun) M. W. GODA BAKER, Ministry of Lands and Mines (Liberia) R. R. BAKER, Texaco (Gabon) P. BALOGUN, Phillips (Nigeria) J. R. BARBER, Pan Ocean (Nigeria) C. BETTUZZI, Elf-Aquitaine (Cameroun, Congo, Gabon, Nigeria) P. BIRO, Gulf (Gabon...

... drilling on the blocks it holds jointly with Agip. A test east of its Sunza well found the potential reservoirs water bearing. A wildcat, the Moembila North, in the northwestern part of the block, also found water and was abandoned. At year end, Elf was testing in a deep well just north of the Yanga field...