Articles tagged with Fossil Records
A new study used fossil cores from northeastern Italy to test a thought experiment on mass extinctions. The results showed that the fossil record can produce a misleading picture if not interpreted with care, suggesting smaller bursts of extinctions over a longer timeline rather than a single massive die-off.
Researchers analyzed over 4,000 mosasaur fossil specimens to determine if quality impacts our understanding of past biodiversity. The study found that the rich fossil record provides an accurate picture of mosasaur diversity and evolutionary history despite variable completeness.
Research suggests that uneven fossil sampling patterns, rather than climate dynamics, are the primary driver of fluctuations in early hominin species diversity. Peak taxic diversity was linked to maximal rock exposure and collection effort.
The study reveals that flowering plants diversified suddenly in the Cretaceous period, while molecular-clock dating suggests an older origin. The discrepancy is attributed to false precision on both palaeontological and molecular evolutionary timescales.
A study covering 300 million years of evolutionary history found that only a few extinct animals developed tail weaponized features. The researchers identified four essential traits: large body size, armor, herbivory, and thoracic stiffness. These conditions are rarely seen in living animals, explaining the rarity of modern tail weaponry.
A new study of 311 hominin fossils spanning four million years shows that stature and body mass advanced at different speeds. Hominin bodies evolved in 'pulse and stasis' fluctuations, with some lineages even shrinking.
Researchers found that male woolly mammoth specimens were more common in the fossil record due to their tendency to travel alone and fall into natural traps. The discovery highlights the utility of fossil remains for studying extinct animal behavior and social structures.
A GW researcher argues that the human genus may have originated by chance, rather than in response to environmental changes. Computer simulations suggest that clusters of species originations could be caused by random fluctuations, rather than a single broad-scale event.
Conservationists from around the world gather to discuss a critical shift in thinking, recommending a more vigorous application of information from the fossil record. They suggest embracing novelty in ecosystems while preserving natural diversity, highlighting cases where conservation can benefit both humans and nature.
A new study reveals that parrotfish play a vital role in maintaining healthy coral reefs. When parrotfish were more abundant, the reef grew faster and remained healthier due to their algae-eating habits. The research suggests that conserving parrotfish populations is essential for protecting corals.
A new study of fossil records found that the modern latitudinal diversity gradient for North American mammals is an exception to the rule, with more species at the equator than poles. The team analyzed 63 million years of mammalian life and found a strengthening of the gradient between 10 million and 4 million years ago.
A recent study by three paleontologists reveals that over 85% of mammal species at high risk of extinction lack a fossil record. The researchers found that body size and geographical range are key factors in determining whether a species will leave behind a fossil legacy.
A newly discovered dinosaur, Timurlengia euotica, lived about 90 million years ago and fills a 20 million-year gap in the fossil record of tyrannosaurs. The species had developed keen senses and cognitive abilities, including low-frequency hearing, which positioned it to take advantage of opportunities to reach the top of its food chain.
Researchers found that more fossil bones have been lost in regions like the continental US and South America compared to Alaska and areas near the Bering Strait. This variation complicates population size estimates of extinct species across the Americas.
Researchers propose astrophysical explanation for discrepancies between molecular clock and fossil record, suggesting increased cosmic radiation accelerated mutation rates. The hypothesis predicts that organisms in deeper ocean layers will show less disparity between the two methods.
Researchers have identified six additional species of carnivorous theropods from isolated teeth in the South Pyrenees Basin in Spain. The study quadrupled the known diversity of dinosaur fossils in the area, providing new insights into the evolution and extinction of these creatures.
A newly discovered, 48-million-year-old fossil of the 'Jesus lizard,' Babibasiliscus alxi, has been found in Wyoming. The ancient reptile may have thrived in a once-tropical habitat and provides valuable insight into how climate change affects tropical species.
A new study by Yale University reveals that early human ancestors may have had precision grip capabilities comparable to modern humans. The research team created a kinematic model of the thumb and index finger of living primates and fossil remains, finding that even ancient species like Australopithecus afarensis had impressive dexterity.
Researchers found that beetles have among the lowest family-level extinction rates due to their ability to adapt to changing environments. The study suggests that beetle diversity may be due to an historically low extinction rate rather than a high rate of new species emerging.
Researchers have discovered that bacteria play an active role in the decay and preservation of soft-bodied organisms, leading to their fossilization. The study, published in Nature Communications, sheds new light on the process of fossil formation and how it can inform our understanding of early animal evolution.
A team of scientists has reconstructed a detailed 'tree of life' for turtles, revealing their closest relatives across the animal kingdom. The study uses next-generation sequencing technologies to refute long-held debates about turtle evolution and places turtles in a new group called 'Archelosauria'.
A new study by University of Oregon geologist Edward B. Davis and colleagues found that fossil records of five ancient mammalian species point to weaknesses in ecological niche models and hindcasting methods used to predict future animal and plant habitats.
Researchers presented findings on North America's future fire threats and the role of humans in megafauna disappearance. Paleontological data is being used to inform studies of modern ecological processes and communities.
Researchers have re-examined the British fossil record over 550 million years and found that only the area of preserved rock drives biodiversity, casting doubt on previous methods used to correct for bias in the fossil record.
A study from the University of Bristol and Bergen found that geological factors like rock area drive biodiversity, rather than measures like fossil collections or formations. This discovery alters our understanding of life's history through time.
The discovery of fossilized fish specimens from the Cambrian period sheds new light on the evolution of vertebrates. The fossils show pairs of exceptionally well-preserved arches near the front of their body, which led to the evolution of jaws in vertebrates.
Research at the University of Granada shows that fossils can be used to study cyclical paleoenvironmental changes with varying time scales. The study characterizes irregular cycles lasting from less than a day to over a million years, revealing patterns in extinction events and ecological responses.
Scientists discover fossilized eggs and embryos of tiny marine crustaceans, revealing a 450-million-year-old species that took care of its young in the same way as modern relatives. The finding provides conclusive evidence of reproductive strategy conservation across millennia.
A new study examines the geological legacy of Hurricane Irene, shedding light on the long-term record of storm frequency and impact. The researchers found that the lack of definitive signatures from the hurricane in paleostorm records highlights concerns about current understanding of hurricane deposition and preservation.
New research confirms the 'out of the tropics' model for tropical biodiversity, where most evolutionary lineages started in the tropics and expanded outward. Bridge species, which straddle the boundary between tropics and temperate regions, play a crucial role in this process.
Researchers studied an extinct South African reptile, Eunotosaurus, to understand the evolution of the turtle shell. The findings revealed that the shell is made up of approximately 50 bones and was gradually modified over millions of years.
A 505 million-year-old fossil, Kooteninchela deppi, discovered in British Columbia, is a distant ancestor of lobsters and scorpions. Its 'scissor hand-like' claws were named after Johnny Depp's starring role in Edward Scissorhands.
The newly discovered Dahalokely tokana is an abelisauroid dinosaur that lived around 90 million years ago. Its fossils found in Madagascar preserve a mix of features from dinosaurs on both the island and the Indian subcontinent, sparking questions about its relationships to these ancient animals.
Research by Alison Boyer found that nearly 983 land bird species became extinct between the first human arrival and European colonization due to overhunting, forest clearance, and introduced species. The study also reveals that flightless species were more likely to go extinct than those with flying abilities.
Researchers found fossil evidence that small crocodiles fed on baby ornithopod dinosaurs, revealing a new dimension to the food chain. The discovery also uncovered a previously unrecognized small ornithopod dinosaur species.
A multidisciplinary team of researchers investigated how whales got their teeth by analyzing the fossil record and embryonic development process. They found that whales evolved simpler teeth around 30 million years ago, which are shaped by proteins BMP4 and FGF8 during development.
Researchers found drastic changes to marine communities due to higher temperatures and lower oxygen levels, leading to potential extinction of marine life. The study mirrors current climate predictions over the next century, highlighting the need for urgent action.
Researchers have shed new light on the sudden appearance of flowering plants, revealing a 45 million-year evolutionary history. Angiosperms colonized aquatic environments over three phases, with co-evolution with insects playing a vital role in their spread.
A team of marine scientists warns that life in the world's oceans is facing a major shock due to human activities. The researchers have compared past extinctions with current trends, finding that global warming, acidification, and pollution are driving mass extinctions today, similar to those that occurred 500 million years ago.
Scientists found that giant insect sizes decreased after birds evolved around 150 million years ago. Insect size was linked to oxygen levels over hundreds of millions of years, with high oxygen concentrations allowing larger insects during the late Carboniferous period.
Researchers at University of Alberta identify new coelacanth fossil, Rebellatrix, which challenges theory of evolutionary stagnation. Found in British Columbia, the 240-million-year-old species had a forked tail, indicating it was a fast-moving predator.
Scientists link periodic extinctions and increased strontium-87 in marine fossils to a 60-million-year cycle of continental uplift. This process may have reduced sea depth, leading to habitat loss and decline in marine biodiversity.
A new study found that vertebrate evolution exhibits 'head-first' diversity, where head features diversified before body shapes and types around extinction events. This discovery contradicts previous models of adaptive radiations, suggesting feeding-related pressures are the initial drivers of diversification.
Magnetic pole reversals occur frequently over millions of years, with hundreds of occurrences recorded in the past three billion years. The process is gradual and does not have significant effects on plant or animal life, climate, or glaciation.
A new study reveals that ancient global carbon, sulfur cycles, and sea-level changes drove the evolution of marine life over 500 million years. The research found a strong connection between these factors and marine biodiversity.
A new study reveals that changes in ocean chemistry and sea level have robustly driven marine life evolution over the past 500 million years. The findings suggest a strong connection between environmental proxy records and fossil diversity.
Researchers have produced the smallest arthropod fossil ever scanned using X-ray CT techniques, a 176-micron-long prehistoric mite trapped in Baltic amber. The study reveals almost 50 million years of evolution among these mites of phoretic behavior using another species.
University of Pennsylvania researchers have developed a new technique for analyzing phylogenies, showing that the results stand up against known fossil history of whale species. The method allows for changing rates of speciation and extinction over time and among lineages.
A well-preserved fossil of a shrew-like mammal discovered in northeast China provides new information about the earliest ancestors of placental mammals. The discovery, dated to 160 million years ago, fills an important gap in the fossil record and helps to calibrate modern DNA-based methods of dating evolution.
A team of researchers studied the evolution of parareptiles, finding that they were not hit as hard by the end-Permian extinction as previously thought. The study used evolutionary relationships to infer missing diversity and revealed new patterns in the fossil record.
A 360-million-year-old mass extinction event devastated fish populations, allowing crinoids to thrive and diversify. The study found that the ripple effects of this extinction event could last millions of years.
A new review highlights the importance of geohistorical data in conservation biology, providing insights into species responses to climate change. Fossil records show that some species persisted in suitable habitats despite range contractions, while others went extinct due to human activities.
A new statistical model reevaluates the timeline of human evolution, suggesting divergence from chimpanzees occurred around 8 million years ago. The revised estimate improves upon previous findings by accounting for gaps in the fossil record and incorporating DNA evidence.
A new study explores the variability in fossil assemblages, finding that communities may be more resilient than thought. The researchers used living and fossil communities to investigate the factors affecting the low variability seen in fossil records.
A new analysis of the plant family tree suggests that flowering plants may be considerably older than previously thought, with origins dating back to 215 million years ago. This finding fuels ongoing debates over different approaches to dating the tree of life and contradicts previous fossil record estimates.
A new model for primate origins suggests that major groups are correlated with Mesozoic tectonic features and evolved from a widespread ancestor in Pangea. The theory incorporates spatial patterns of primate diversity and distribution as historical evidence, avoiding previous limitations to fossil record and molecular clocks.
Ancient DNA analysis reveals new horse species in Eurasia and South America, with the Cape zebra found to be a large variant of the modern Plains zebra, while a small hippidion horse was discovered in South America. A new ass species also appears related to European fossils dating back 1.5 million years.
Researchers found molecular decay of the enamelin gene in toothless mammals, correlating with enamel loss in the fossil record and supporting evolutionary change. The study provides fresh evidence for Charles Darwin's theory of evolution, linking morphological degeneration to molecular decay.
In the Caribbean Sea, environmental changes led to a shift from clonal to sexual reproduction among cupuladriid bryozoans. This shift enabled species to survive by becoming more robust against fragmentation, while those that failed to adapt went extinct.
A new study has found that large size and fast bite were the main reasons for the extinction of certain fish 65 million years ago. Today, these same features characterize large predatory fishes that are in decline and at risk of extinction themselves.