101. Drevermann, Fr. Ueber Untersilur in Venezuela. N. Jahrb., 1904, vol. i, pp. 91-3, pl. [1904].
102. Foster, C. Le Neve. On the Caratal Goldfield. Quart. Journ. Geol. Soc., vol. xxv, pp. 336-43 [1869].
103. Gerhardt, K. Beitrag zur Kenntniss der Kreideformation in Venezuela und Peru. N. Jahrb., Beilage-Band xi, pp. 65-117 [1897].
104. Humboldt, F. H. A. v. Esquisse d’un Tableau Géologique de l’Amérique méridionale. Journ. Phys., t. liii, pp. 30-59 [1801].
105. ⸺. Account of the Earthquake which destroyed the Town of Carácas on the 26th March, 1812. Edinb. Phil. Journ., vol. i, pp. 272-80 [1819].
106. Karsten, H. [Letter from Puerto Cabello on the Geology of Western Venezuela.] Ber. Acad. Wiss. Berlin, 1849, pp. 197-200.
107. ⸺. [On Neocomian Rocks near Trujillo.] Ibid., pp. 370-6.
108. ⸺. [Tertiary and Cretaceous in Cumaná and Barcelona.] Zeitschr. deutsch. geol. Ges., bd. ii, pp. 86-8 [1850].
109. ⸺. Beitrag zur Kenntniss der Gesteine des nördlichen Venezuela. Ibid., pp. 345-61.
110. ⸺. Ueber die geognostische Verhältnisse des nördlichen Venezuela. Archiv. Min. Geogn., bd. xxiv, pp. 440-79 [1851].