. Transazioni. Rinidad. Nell'Istmo di Tehuantepec, l'olio in quantità considerevole viene prodotto da cupole saline apparentemente simili a quelle del Texas e della Louisiana. Nella regione Tampico estremamente ricca, l'olio è associato a tappi e dighe ig-neous, E a Cuba e l'Isola dei Pini, si verifica eitherin serpentina (o roccia ignea decomposta) o vicino al contatto betweenserpentina e rocce sedimentarie altamente ripiegate. Le evidenze di igneousaction sono abbondanti in tutta la regione del Golfo del Messico, tranne nella porzione che appartiene agli Stati Uniti. Forse le indicazioni più interessanti o
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. Transactions. rinidad. In the Isthmus of Tehuantepec, oil in considerable quantity is pro-duced from salt domes apparently similar to those in Texas and Louisiana.In the tremendously rich Tampico region, the oil is associated with ig-neous plugs and dikes, and in Cuba and the Isle of Pines, it occurs eitherin serpentine (or decomposed igneous rock) or near the contact betweenserpentine and highly folded sedimentary rocks. Evidences of igneousaction are plentiful throughout the Mexican Gulf region except in thatportion belonging to the United States. Perhaps the most interesting indications of oil in the whole region arethose which reveal its presence beneath the Gulf of Mexico itself. Lieut.John C. Soley, U. S. N., 3 in his paper on The Oil Fields of the Gulf ofMexico, gives a chart showing the location of all reported occurrences, and discusses their origin and geologic significance. This chart is re- 3 Scientific American Supplement (Apr. 9, 1910) 69, 229. 506 DEEP-SEATED OIL DEPOSITS ON GULF COAST. ANTHONY P. LUCAS 507 produced herewith (Fig. 2), together with extracts from his interestingpaper. Location.—The accompanying chart shows the position and extent of theoil field as located by the reports received during the last five years.4 The area withinwhich floating oil has been found extends from latitude 26 deg. N. to 28 deg. 30 min.N., and from longitude 89 deg. W. to 93 deg. W. As the location extends in the direc-tion of the flow of the main current of the Gulf Stream, it is probable that the areashown is much larger than the actual area from which the oil escapes. The mostactive part of the field is about 120 miles south of Trinity Shoal off the Louisiana coast. History.—The appearance of bitumens in various shapes in the Gulf of Mexico dates back to the earliest history of this country The floating oil has been noticed from time to time and has been reported in the newspapers occasionally, butin later years records have been kept carefully so that it is
