L. V. Dalton — Geology of Venezuela. 209 



other points in the Andes, the Caribbean Series, or the Cretaceous 

 I'ocks in association therewith, contain copper ores, some of which 

 have been worked. Galena, both argentiferous and otherwise, also 

 occurs in the granite region of the Andes. 



Petroleum, in its varied forms, occurs at many points in I^orthern 

 Venezuela, and appears to exist in greater or less quantity in all 

 groups from the Segovia Sandstones to the Cumana Series. The 

 asphalt of Bermudez, from the last-named series, has become widely 

 known, and the oil of Trujillo and Tachira, from Cerro de Oro rocks, 

 has been exploited to some extent by local companies. Sulphur is 

 found in considerable quantity, presumably in the Capacho Limestones, 

 both in Eastern Venezuela and in Falcon. Mention may also be 

 made here of the ' Urao ' lake at Lagunillas, near Merida, which 

 contains a large proportion of Sesqui — carbonate of soda, rarely found 

 in nature ; and apparently in this case derived from rocks of the 

 Segovia Group. 



VI. BiBLIOGRAPHT. 



Ahkensbukg (H.). " Erdbeben in Caracas": Mitt. Geogr. Ges. Jena, 



Bd. xix, pp. 56-8, 1901. 

 Attwood (G.). "a Contribution to South American Geology": Quart. 



Journ. Geol. Soc, vol. xxxv, pp. 582-90, map, 1879. 

 Bendrat (T. a.). "Geologic and Petrographie Notes on the Eegion about 



Caicara, Venezuela" : Amer. Journ. Sci., ser. IV, vol. xxxi, pp. 443-52, 



1911. 

 BOUSSINGAULT (J. B.). " Les Sources Thermales de la Chaine du littoral du 



Venezuela" : Compt. Eend., t. xci, pp. 836-41, 1880. 

 BuCH (L. v.). "Von Aptychus, und iiber die Anden von Venezuela": 



Zeitschr. deutsch. geol. Ges., Bd. ii, pp. 339-44, pi. x (1850). 

 Cortes (E.). " Escursioni geologiche al Venezuela " : Boll. Soc. Geol. ItaL, 



vol. XX, pp. 447-69, 1901. 

 Drevermann (Fr.). " Ueber Untersilur in Venezuela": N. Jahrb., Bd. i, 



pp. 91-3, pi., 1904. 

 Foster (C. Le Neve). "On the Caratal Goldfield " : Quart. Journ. Geol. 



Soc, vol. XXV, pp. 336-43, 1869. 

 Gerhardt (K.). " Beitrag zur Kenntniss der Kreide-formation in Venezuela 



und Peru " : N. Jahrb., Beilage-Band xi, pp. 65-117, 1897. 

 Humboldt (F. H. A. v.). " Esquisse d'un Tableau Geologique de I'Am^rique 



meridionale " : Journ. Phys., t. liii, pp. 30-59, 1801. 



" Account of the Earthquake which destroyed the town of Caraccas on 



March 26, 1812 " : Edinb. Phil. Journ., vol. i, pp. 272-80, 1819. 



Karsten (H.). "Letter from Puerto Cabello on the Geology of Western 



Venezuela" : Ber. Acad. Wiss. Berlin, 1849, pp. 197-200. 

 " On the Neoccmian Rocks near Trujillo " : ibid., pp. 370-6. 



"Tertiary and Cretaceous in Cuman4 and Barcelona": Zeitschr. 



deutsch. geol. Ges., Bd. ii, pp. 86-8, 1850. 



" Beitrag zur Kenntniss der Gesteine des nordlichen Venezuela " : ibid., 



pp. 345-61. 



' ' Ueber die geognostische Verhaltnisse des nordlichen Venezuela ' ' : 



Archiv Min. Geogn., Bd. xxiv, pp. 440-79, 1851. 



' ' Geognostische Bemerkungen iiber die Umgebungen von Maracaibo und 



iiber die Nordkiiste von Neu Granada " : ibid., Bd. xxv, pp. 567-73, 1853. 



■ " Eeise-notizen liber die Provinz Cumana in Venezuela " : Westermann's 



Monatshefte, 1859. 



"Die geognostische Beschaffenheit der Gebirge der Provinz Caracas " : 



Zeitschr. deutsch. geol. Ges., Bd. xiv, pp. 282-7, 1862. 



G&ologie de Vaiicienne Colombia Bolivarienne. 4to ; pp. 62, map. 



Berlin, 1886. 



DECADE V. — VOL. IX. — NO. V. 14 



