Geologic reconnaissance in western Liberia

Leo, Gerhard W.; White, Richard W.

doi:10.3133/ofr67147

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…'We believe, however, that the major part of the quartz grains are derived from upcountry crystalline rocks that contain quartz. These include mainly massive to gneissoid granitic rocks, granitic to quartz dioritic gneisses, quartzo-feldspathic gneisses of sedimentary origin, some quartzites, amphibolites, and quartzbearing granulites (Leo and White, 1967).…”

Section: Geologic Settingmentioning

confidence: 99%

Silica sand deposits in the Monrovia area, Liberia

Rosenblum¹,

Srivastava²

1970

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Section: Geologic Settingmentioning

confidence: 99%

Silica sand deposits in the Monrovia area, Liberia

Rosenblum¹,

Srivastava²

1970

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“…l). However, little information about these rocks has been published ' (Newhouse and others, 19^5;Offerberg and Tremaine, 196*1;Leo and White, ;Jones, 1968), and much of this is not widely available. Recent mapping has shown that these rocks occupy two basins along the coast, called the Roberts and Bassa basins, the limits of which have been fixed…”

Section: Introductionmentioning

confidence: 99%

Sedimentary rocks of the coast of Liberia

White¹

1969

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Two basins containing sedimentary rocks of probable Cretaceous age have been recognized near the coast of Liberia in the area between Monrovia and Buchanan; geophysical evidence suggests that similar though larger basins may exist on the adjacent continental shelf. The oldest sedimentary unit recognized, the Paynesville Sandstone of possible early to middle Paleozoic age, is intruded by dikes and sills of diabase of early Jurassic age and lies unconformably on crystalline rocks of late Precambrian age. Dips in the Paynesville Sandstone define a structural basin centered south of Roberts International Airport (formerly called Roberts Field) about 25 miles east of Monrovia. Vackes and conglomerates of Cretaceous age, herein named the Farmington River Formation, unconformably overlie the Paynesville Sandstone and constitute the sedimentary fill in the Roberts basin* The Bassa basin lies to the southeast of the Roberts basin and is separated from it by an upwarp of crystalline rocks. The basin is occupied by wackes and conglomerates of the Farmington River Formation, which apparently lie directly on the crystalline basement. Both basins are bounded on the northeast by northwest-trending dip-slip faults.Hie best potential for petroleum deposits that exists in Liberia is beneath the adjacent continental shelf and slope. Geophysical exploration and drilling vill be required to evaluate this potential*

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