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| Las Flores Formation | |
|---|---|
| Name | Las Flores Formation |
| Type | Geological formation |
| Period | Miocene |
| Age | Early to Middle Miocene |
| Primary lithology | Sandstone, siltstone, shale |
| Other lithology | Conglomerate, limestone |
| Namedfor | Las Flores |
| Region | Buenos Aires Province, Argentina |
| Country | Argentina |
Las Flores Formation is a Miocene stratigraphic unit in Buenos Aires Province, Argentina, known for its siliciclastic and carbonate lithologies and diverse vertebrate fossils. The formation crops out in coastal and inland basins and has been the focus of regional studies in South American paleontology, sedimentology, and basin analysis. Research on the unit has involved collaborations among Argentine institutions, international universities, and museum collections.
The formation consists predominantly of sandstone, siltstone, and shale interbedded with conglomerate and localized limestone horizons, reflecting variable clastic supply and episodic carbonate deposition. Field mapping by Argentine geologists and stratigraphers from institutions such as the University of Buenos Aires and the CONICET has documented facies including channelized sandbodies, overbank fines, and fossiliferous shelly beds. Petrographic studies using thin sections and scanning electron microscopy conducted in collaboration with researchers at the Museo de La Plata and the Smithsonian Institution document quartz-rich sand, volcanic lithic fragments, and calcite cementation typical of shallow marine to fluvial-deltaic systems. Structural context relates to the tectono-sedimentary evolution of the Pampean Plain and the marginal basins influenced by the South American plate margin and intraplate flexure.
Biostratigraphic correlations using mollusks, foraminifera, and vertebrate remains place the formation within the Early to Middle Miocene, broadly correlating with regional units such as the Puerto Madryn Formation and the Gaiman Formation. Magnetostratigraphic and radiometric constraints from interlayered volcanic ash beds have been integrated with chronostratigraphic frameworks developed by teams from the International Commission on Stratigraphy and South American stratigraphers. Regional sequence stratigraphy links the unit to transgressive-regressive cycles associated with the Miocene marine incursions recorded across the South Atlantic margin and the Patagonian Shelf.
The formation yields a rich assemblage of marine and terrestrial fossils, including cetaceans, pinnipeds, sharks, bony fishes, turtles, crocodilians, rodents, notoungulates, and diverse invertebrates such as bivalves, gastropods, and echinoderms. Specimens recovered by expeditions from the Museo Argentino de Ciencias Naturales Bernardino Rivadavia, the American Museum of Natural History, and the Royal Society collections have informed phylogenetic studies of Miocene faunas. Notable finds include early mysticete and odontocete whales comparable to taxa described from the Santa Cruz Formation and the Monte León Formation, as well as pinniped material that contributes to discussions linked to the Panama Isthmus closure and faunal interchange. Paleontological work has produced taxonomic descriptions in journals coordinated by editorial boards at institutions such as the International Paleontological Association.
Sedimentological, paleontological, and geochemical analyses indicate deposition in shallow marine to marginal-marine settings with intervals of fluvial influence, delta progradation, and estuarine conditions. Stable isotope studies and paleoecological reconstructions carried out by researchers affiliated with the National University of La Plata and the University of Córdoba suggest fluctuating salinity and productivity related to Miocene climatic trends and regional uplift events tied to the Andean orogeny. Paleogeographic syntheses place the formation within coastal systems that bordered the South Atlantic Ocean and connected with Patagonian and northern Argentine basins, facilitating faunal exchanges documented in biogeographic studies by scholars associated with the Society of Vertebrate Paleontology.
Although not a major hydrocarbon reservoir like some Cenozoic Argentine basins, the formation hosts potential groundwater aquifers exploited by local municipalities and agricultural enterprises in the Buenos Aires Province. Aggregate and construction stone extraction from resistant sandstone units has been undertaken by regional companies registered with the Argentine Ministry of Production, and paleontological localities have become components of geotourism initiatives promoted by provincial cultural agencies and the Museo Municipal networks. Environmental assessments by consulting firms and academic groups address groundwater quality, land-use planning, and heritage conservation in areas of active extraction.
Initial stratigraphic descriptions and fossil reports emerged from 19th and early 20th century naturalists working in Argentina, including collectors and curators at the Museo de La Plata and the Museo Argentino de Ciencias Naturales Bernardino Rivadavia. Systematic mapping, formal naming, and modern stratigraphic revisions were published by Argentine geologists and paleontologists associated with the Servicio Geológico Minero Argentino and universities such as the National University of La Plata. International collaborations involving researchers from institutions like the Smithsonian Institution, the Natural History Museum, London, and the American Museum of Natural History advanced taxonomy and depositional models, leading to ongoing multidisciplinary projects integrating paleontology, sedimentology, and geochronology.
Category:Geologic formations of Argentina Category:Miocene Series of South America Category:Paleontology in Argentina