A set of tiny fossil flowers found in Patagonia It is helping to rewrite what the landscapes shared by giant dinosaurs looked like. At a site in the Argentine province of Chubut, the same one where the famous Patagotitan mayorum was discovered, an international team of specialists identified exceptionally well-preserved floral remains dating back some 101 million years.
These flowers, grouped into a new species called Patagoflora minimaThese have become some of the oldest and best-dated evidence of flowering plants in the Southern Hemisphere. Their study not only allows us to complete the puzzle of early evolution of angiospermsbut also to reconstruct in more detail the ecosystem that dominated this region of Gondwana during the Cretaceous.
A historic discovery in Patagonia
The discovery occurred in the Cerro Barcino FormationIn Chubut, a series of Lower Cretaceous rocks was already famous for having yielded the remains of a herd of titanosaurs, including the gigantic Patagotitan mayorum. During the excavation campaigns carried out in 2014 at the La Flecha ranch, the main objective was to recover more than 150 bones of this colossal sauropod, considered the largest dinosaur known to date.
While the paleontological and paleobotany I was working on the skeleton of Patagotitan, and they began to appear, a few meters from the main front, flagstones with plant impressions, fossilized wood, and even leavesAt that time, the researchers focused on documenting all the material, without suspecting that among those plant remains were hidden fossilized flowers of extraordinary value.
The detailed analysis came later, in the laboratory. By examining the contents of the rocks with a magnifying glass, the specialists detected flowers less than one centimeter in diameter, very well preserved, which allowed observation of fine morphological structures characteristic of primitive angiospermsIt was then that the discovery went from being a simple botanical curiosity to becoming a key reference point for the paleobotany of the southern hemisphere.
The results of the research were published in the scientific journal Cretaceous ResearchThe article describes the new species and details the geological and paleontological context of the site. The study emphasizes that this is one of the oldest and most accurate floral records from Gondwana, giving it particular weight in debates about the origin and spread of flowering plants.
Patagoflora minima: the tiny companion of Patagotitan
The new species was named Patagoflora minimaThe name plays on the contrast between the tiny flower and the enormous dinosaur found in the same area. “Patago” refers to Patagonia, “flora” alludes to its plant-like nature, and “minima” highlights its microscopic size compared to the colossal Patagotitan mayorum.
According to the published description, the flowers are pistillate, pentamerous, and actinomorphicwith a diameter of less than 10 millimeters. This set of characteristics places them among the early angiosperms of the Upper Albian, a stage of the Lower Cretaceous that is key to understanding the diversification of flowering plants.
One of the most relevant characteristics of Patagoflora minima is that it offers direct evidence of pentamerous morphology (with structures in groups of five) in the first angiosperms that inhabited southwestern Gondwana. Until now, much of the information about these plants came from the northern hemisphere, which generated a strong geographical bias in evolutionary models.
The fossil material includes numerous specimens, some very complete and others deformed or fragmentary. abundance of specimens It allows for the comparison of variations within the species, although it also poses challenges when it comes to accurately interpreting certain anatomical details, due to compression and the processes of fossilization.
Despite the flowers' good preservation, scientists have not yet been able to reconstruct the appearance of the entire plantThe floral remains are not attached to leaves, stems, or branches, making it difficult to place them precisely within a specific lineage. The possibility that they belonged to herbaceous plantsHowever, the presence of angiosperm wood at the site suggests that some of them may have been shrubs or small trees.
Flowers and dinosaurs: a snapshot of the Patagonian Cretaceous
One of the most striking aspects of the discovery is that it is One of the few cases in the world where flowers and dinosaurs appear fossilized togetherThe flowers of Patagoflora minima were preserved in a fluvio-lacustrine environment, that is, in ancient areas linked to rivers and lakes, the same environment where the titanosaurs of the region lived and died.
In that scenario, the landscape would be dominated by conifers, ferns and other plantsMeanwhile, angiosperms were beginning to diversify and occupy new ecological niches. Researchers do not rule out the possibility that some of these flowering plants formed part of the diet of large herbivores, although this hypothesis cannot be directly proven at this time.
The association of flowers with other plant remains—such as leaves, seeds and fossil wood— helps to reconstruct in greater detail the vegetation of the Early Cretaceous in Patagonia. This reconstruction is essential to understanding how the ecosystems in which the largest land animals in history lived were organized.
The Cerro Barcino Formation site has therefore allowed us to obtain a kind of "fossilized snapshot" where the following are combined dinosaur remains, plants and sediments These deposits record episodes of flooding, inundations, and environmental changes. This sedimentary context favored the preservation of delicate structures such as flowers, which rarely appear in the fossil record.
For European paleontology, this type of deposit in Patagonia offers a very valuable reference, as it allows Compare the evolution of the ecosystems of Gondwana and Laurasia (the two large continental blocks into which the supercontinent Pangaea was divided). Data from southern South America are key to verifying whether the trends observed in the northern hemisphere are repeated at other latitudes.
A void that is beginning to be filled in the southern hemisphere
Until very recently, most of the records of early fossil flowers They came from the northern hemisphere, especially Europe, North America, and some areas of Asia. This imbalance was due to the distribution of the sites, the preservation conditions, and the research history itself.
The discovery of Patagoflora minima in Patagonia contributes to reduce those information gaps This allows us to refine hypotheses about the origin and rapid expansion of angiosperms. Having a well-dated record in southern Gondwana allows us to compare chronologies and evolutionary trajectories, which is fundamental to addressing one of the great enigmas of evolutionary biology: how and why flowering plants came to dominate most of today's terrestrial ecosystems.
The study emphasizes that this is the first record of Albian flowers For southern South America, this represents a stage of the Cretaceous period in which angiosperms were undergoing accelerated diversification. Having direct data from this phase in Patagonia helps to better calibrate evolutionary clocks and assess the speed at which this radiation occurred.
For the European scientific community, and particularly for paleobotanical teams from countries like Spain, France, or Germany, these fossils represent a unique opportunity for collaboration and contrastMany models of angiosperm expansion have been built from deposits in the northern hemisphere, so integrating Patagonian evidence requires revising and refining those proposals.
The fact that flowers are preserved associated with other plant and animal remains also allows us to address broader paleoecological questions, such as the structure of plant communities, the dynamics of Cretaceous forests or the possible interactions between plants and herbivores. This is an approach that goes beyond the specific description of a new species to place it in a broader ecological and geographical context.
An international project with Spanish participation
The research on fossil flowers in Patagonia has been the result of a international collaboration The project involves institutions from Argentina, Spain, and the United States. The team is led by paleobotanists from the Egidio Feruglio Paleontological Museum (MEF) and CONICET, with support from the Teruel-Dinópolis Paleontological Foundation and Cornell University.
The signatories of the work include Giovanni Nunes, Ignacio Escapa and N. Rubén Cúneo The team includes researchers from MEF-CONICET, as well as Spanish researcher Luis Miguel Sender, affiliated with the Teruel-Dinópolis Paleontological Foundation and the Aragonese Museum of Paleontology. Paleobotanist Maria A. Gandolfo, from Cornell University (United States), completes the team.
The link with the Teruel-Dinópolis center This is especially relevant for the European context, as this institution is a leading center for the study of dinosaurs and Mesozoic ecosystems on the Iberian Peninsula. Spanish participation in the analysis of Patagoflora minima facilitates direct comparison between the fossil records of Aragon and those of Patagonia, two regions that share a strong scientific interest in vertebrate and plant paleontology.
This type of collaboration allows both Spain and other European countries to have access to first-hand data on key deposits in South AmericaThis enriches the research and fosters joint projects. It is not uncommon for the results obtained in Patagonia to end up being integrated into exhibitions, educational materials, and outreach programs in European museums.
Furthermore, publication in an international journal like Cretaceous Research guarantees that the data on the fossil flowers of Patagonia are accessible to the global scientific community, facilitating their incorporation into comparative studies and meta-analyses on the early evolution of angiosperms.
What remains to be discovered in Cretaceous Patagonia
Despite the importance of the discovery, researchers insist that Patagoflora minima is just the beginningThe team has already announced its intention to continue with new field campaigns in the Chubut region, with the aim of locating better preserved specimens and, if possible, plant remains directly associated with the flowers.
Finding flowers attached to leaves, stems, or roots would allow to define more precisely the type of plant This would help determine the origin of these reproductive organs and place it within a specific group in the angiosperm evolutionary tree. This would also contribute to a better understanding of the plant diversity that coexisted with Patagotitan and other dinosaurs in Patagonia.
Each new fossil that appears in the Cerro Barcino Formation provides clues about how the landscape and climate changed during the Early Cretaceous. Fluvio-lacustrine sediments, layers with remains of floods, and levels rich in organic matter allow us to reconstruct episodes of flooding, drier periods, and the dynamics of ancient river and lake systems.
From a European perspective, closely following this work is of clear interest: the data from Patagonia help to complete the global map of the evolution of flowering plants and compare how different ecosystems responded to environmental changes from more than 100 million years ago.
The scientific team emphasizes that, as the research progresses, it is likely that more will emerge new species of fossil plants in the area, which will allow for a more detailed reconstruction of the composition of the forests and vegetation of Cretaceous Patagonia. These advances, in turn, will have repercussions for the models used in Europe to reconstruct Mesozoic landscapes.
The identification of these tiny fossil flowers in Patagonia, associated with the colossal Patagotitan, has provided a privileged window to the pastThis shows that, while the largest dinosaurs roamed southern Gondwana, flowering plants were beginning to expand and transform ecosystems. The collaborative work of institutions in Argentina, Spain, and the United States has not only allowed Patagoflora minima to be recognized as a key piece in the history of angiosperms, but has also opened new lines of research that will foreseeably continue to provide information on how the landscapes that we are now trying to unravel from laboratories and museums around the world were configured millions of years later.
