. Ecuador, Perú : Cuyabeno-Güeppí. Natural history; Natural history. as flat but slightly tilted surfaces that were likely part of the original alluvial fan surface. During the inventory, I encountered dense gray and red claystone deposits with obvious horizontal layering at the base of a number of soils and stream beds, and in a rock outcrop along the Güeppí River. These deposits match the description of the Marañón Formation by Wessenlingh et al. (2006b). The Marañón Formation, reportedly deposited in a system of lakes and slowly moving rivers following the initial merging of the Andes with
. Ecuador, Perú : Cuyabeno-Güeppí. Natural history; Natural history. as flat but slightly tilted surfaces that were likely part of the original alluvial fan surface. During the inventory, I encountered dense gray and red claystone deposits with obvious horizontal layering at the base of a number of soils and stream beds, and in a rock outcrop along the Güeppí River. These deposits match the description of the Marañón Formation by Wessenlingh et al. (2006b). The Marañón Formation, reportedly deposited in a system of lakes and slowly moving rivers following the initial merging of the Andes with South America, overlies the well known Pebas and Curaray formations, which are associated with deposition during late marine and early Amazonian inland-lake environments (Wessenlingh et al. 2006b). Superimposed on this extremely dynamic landscape are a number of local faults and their associated uplift features. One notable uplift feature is associated with the formation of the Lagartococha complex of blackwater lakes and meandering streams. This fault runs northeast to southwest, and its uplift likely played a key role in the formation of the Lagartococha lake complex as described on page 198 (Fig. 31). Dominant landforms Terraces, rounded hills, saturated valleys, and erosive gullies are the dominant terrestrial landforms across the Cuyabeno-Güeppí region; Figure 29 illustrates these landforms and their relative position in the landscape. High terraces are likely remnants of past depositional surfaces (such as the large alluvial fan described above), of which erosion has not yet worn away the entire original flat (planation) surface. Intermediate and low terraces are active or recently deposited floodplains, and they are common along the entrenched, meandering streams currently draining intermediate elevations of the landscape. Rounded hills are likely former terraces that have been highly eroded. The presence of each landform and the general landscape characterist
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