The geology of the Persian gulf and the adjoining portions of Persia and Arabia

Pilgrim, Guy Ellcock

Bibliographische Daten

Monographie

Strukturtyp:: Monographie

Werks-URN (URL):: https://nbn-resolving.org/urn:nbn:de:kobv:11-710305

URN:: urn:nbn:de:kobv:11-710305

Persistenter Identifier:: BV042953232

Titel:: The geology of the Persian gulf and the adjoining portions of Persia and Arabia

Autor:: Pilgrim, Guy Ellcock

Erscheinungsort:: Calcutta

Verlag:: Office the Geological Survey [u.a.]

Erscheinungsjahr:: 1908

Umfang:: 177 S., 17 Bl. : Ill., graph. Darst., Kt.

Beschreibung:: Geologie und Geographie

Signatur:: Nat. 2000:34:F4

Sammlung:: Allgemeiner Bestand

Wissensgebiet:: Geologie und Geographie

Kapitel

Strukturtyp:: Kapitel

Titel:: Part III. - Economic geology of the Persian Gulf region

Sammlung:: Allgemeiner Bestand

I$0 PILGRIM: GEQLOGY OF:THE PERSIAN GULP. is the oldest in the island. They are probably of Middle Eocene age. From this point a plain begins, only recently vacated by the sea,^ which has left traces of its presence in numerous shelly sandstones^ and other recent alluvial deposits which cover up to a great extent; the* Eocene rocks overlying the Jebel Dukhin bedSj and containing the bitumen. These rocks are for the most part soft marls containing' a greater or. less amount of sand. At Ain El Qar, which is the name: under which the bitumen locality is known to the Arabs, the beds are all dipping some io° to the south-east. About i mile away on the plain still newer beds crop out in some low ridges ; these are'the characteristic soft Nummulitic limestones of which the circle of cliffs1 in Bahrain consists. These are also dipping to the south-east some 6°. , ~ The diagrammatic section on page 114 (Fig. 5) will make this description clearer. It will be apparent therefore that the strata are disposed in a low anticlinal dome, of which the crest lies in or near Jebel Dukhin. The; topmost beds have been denuded and are only represented by the; asphalt-bearing strata and by the low hills mentioned above. Before proceeding to discuss the possibilities of petroleum being found in the area it would be well to deal with the asphalt deposit The accompanying sketch-map (Plate XIII) on the scale of"no feet to the inch shows the relation of the asphalt deposit and the excavations made, to the surrounding hills. The original well was dug by the Arabs and shows the most valuable portion of the deposit which has been; brought to light. Six other pits were dug by Mr. J. C. Gaskjn, the con- tents of which I was able to examine carefully, while I myself dug another pit and deepened the original Arab excavation with the idea of showing the general line taken by the deposit. Below a depth of about 30 feet there was great difficulty experienced in keeping the water out. In the original well (No. 1), there is exposed a great masis of bitu- minous limestone of the same quality as that of which an analysis was^ made n the laboratory of the Imperial Institute, by Professor W. R» Dunstan, M.A., F.R.S;

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Monographie

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