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| Málaga Bay - Buenaventura Bay |
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Pacific Coast: Málaga Bay - Buenaventura Bay
The coastline of Málaga Bay and the northwest side of Buenaventura Bay (Fig. 21) are characterized by vertical to sub-vertical cliffs, 10 to 20 m high, cut into horizontal to sub-horizontal Tertiary sandstones and mudstones (Fig. 22). The coastal relief is characterized by low hills and a terrace level of + 20 m (Fig. 23). Erosional segments of cliff shore alternate with small pocket beaches supplied with sand produced by rapid shore retreat. The numerous stacks and arches are evidence of the retreat. Depositional zones are represented by mangrove-vegetated tidal flats at the eastern sides of Málaga and Buenaventura Bays, and by the Juan Chaco beaches (Fig. 24), an unstable supratidal feature formed with sand from the San Juan delta. South of Málaga Bay, the coast is dominated by steep-plunging cliffs, 10 to 30 m high, cut into horizontal to sub-horizontal Tertiary mudstones and sandstones, with notches and evidence of bioerosion at the intertidal levels.
Figure 21. Geomorphic classification of the San Juan delta and the Buenaventura - Málaga Bay area. Modified from Correa (1996). |
Figure 22. Typical features of the steep cliff coastline between Málaga and Buenaventura Bays. Photo by I. Correa. |
Figure 23. Juan Chaco, showing the +10-m terrace and cliff coastline with caves and structurally controlled entrances cut into subhorizontal mudstones and sandstones. Reproduced by permision of Observatorio Sismológico del Suroccidente Colombiano (OSSO) - Universidad del Valle. |
Figure 24. Northern Juan Chaco beaches. Reproduced by permission of Observatorio Sismológico del Suroccidente Colombiano (OSSO) - Universidad del Valle. |
continue to Buenaventura Bay - Guapi
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