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Coastal and Marine Geology Program > St. Petersburg Coastal and Marine Science Center > Coasts of Colombia

Coasts of Colombia

Coasts of Colombia
Pacific Coast:
Introduction
Serranía del Baudó (Baudó Range)
Cabo Corrientes-
Togoromá
San Juan River Delta
Málaga Bay - Buenaventura Bay
Buenaventura Bay - Guapi
Patía River Delta
Tumaco Bay
Mira River Delta
Gorgona Island
Malpelo Island
References
Caribbean Coast:
Introduction
Guajira Peninsula Coast
Sierra Nevada de Santa Marta Coast
Magdalena River delta and Santa Marta lagoon complex
Barranquilla - Cartagena coast
Southern Caribbean coast
Gulf of Urabá
References
Project Contact:
Robert Morton

Pacific Coast: Gorgona Island

Gorgona Island (Fig. 46) is located at 3º 51'N, 78º 13'W, about 30 km north of Guapi Bay (Fig. 25). The island is composed mainly of basic and ultra-basic igneous intrusive and extrusive rocks, locally classified as komatiites (Echavarria 1982). The island conforms to the so-called "Igneous complex of Gorgona", dated between 66 and 86 ma (Espinoza et al. 1982). The island is about 9 km long and 2.5 km wide, with a maximum height of 338 m. It is surrounded by Gorgonilla Island and by numerous smaller stacks and keys. These erosional remnants together encompass about 615 km2 (Barrios and Mateo Lopez 2001). The shores of Gorgona are predominantly steep plunging cliffs (Fig. 47) and minor sandy and shingle beaches (Fig. 48) supplied, on its eastern side, by coral reef detritus.

Gorgona and Gorgonilla Islands, view to the north.
Figure 46. Gorgona and Gorgonilla Islands, view to the north. Reproduced by permission of Observatorio Sismológico del Suroccidente Colombiano (OSSO) - Universidad del Valle.

Basaltic stack near the northern end of Gorgona Island.
Figure 47. Basaltic stack near the northern end of Gorgona Island. Photo by I. Correa.

Eastern shore of Gorgona Island, with thin sandy-cobble beaches and blocks of basaltic rocks.
Figure 48. Eastern shore of Gorgona Island, with thin sandy-cobble beaches and blocks of basaltic rocks. Photo by I. Correa.

Coastal and Marine Geology Program > St. Petersburg Coastal and Marine Science Center > Coasts of Colombia

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