Paleogene Slope Deposits; Examples from the Chaudiere, Pointe-a-Pierre and San Fernando Formations, Central Range, Trinidad
Hasley Vincent, Grant Wach, 2007. "Paleogene Slope Deposits; Examples from the Chaudiere, Pointe-a-Pierre and San Fernando Formations, Central Range, Trinidad", The Paleogene of the Gulf of Mexico and Caribbean Basins: Processes, Events and Petroleum Systems, Lorcan Kennan, James Pindell, Norman C. Rosen
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Various interpretations have been proposed for depositional environments in the Trinidad-Eastern Venezuela area during the Paleogene, most without supporting sedimentological evidence. We describe lithofacies in the Chaudiere, Pointe-a-Pierre, and San Fernando formations, which suggest that sediment gravity flows were the primary delivery mechanism for the coarse-grained clastics and carbonates that characterize these formations. Outcrop examples of soft sediment deformation, block slides, and floating boulders attest to sediment instability along over-steepened gradients, consistent with a slope environment. Other common facies characteristics include low and high density turbidites and amalgamated channel fills, but there is no evidence for shallow-water reworking of sediments. The reinterpretation of a late Eocene outcrop highlights the need to resolve depositional processes along with biostratigraphy, as estimates of water depths based solely on paleontology may be underestimated. This has implications for Paleogene paleogeographic reconstructions.