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Sentence Examples The layer was generally at the place in the fossil record where the dinosaurs disappeared. The first jawed fish in the fossil record are the acanthodians, which first occur in the Late Silurian. Most jawless species went extinct long ago and are known only from the fossil record. Generally, well-preserved remains of monocot leaves are rare in the fossil record. The fossil record shows that cyanobacteria go back three and a half billion years. There are thousands of animals and plants alive today that are no different from the way they appear in the fossil record! If most speciation is allopatric, what would we expect to see in terms of the fossil record? Seals, sea lions, manatees, and other lineages evolved into swimmers as well, and paleontologists are also filling in their fossil record. He proposed that skeletal robustness should be the most important determinant controlling the temporal resolution of the fossil record. Since aschelminths all lack substantial hard parts, their fossil record is extremely spotty. When dwarf faunas are found in the fossil record, they are invariably associated with times of environmental stress. The fossil record is a potential source of needed data, although fossil asteroids are rare, and they tend to be poorly preserved. In their preferred upland habitat, taeniodonts could have been much more common than the fossil record reflects. His intriguing take on evolution proposed that the apparent saltation of the fossil record actually reflected saltatory events. The Cambrian fossil record suggests that many metazoans were macroscopic and adapted for life in the macrobenthos. The kelps are an important group of marine autotrophs that has left little or nothing in the way of a direct fossil record. The fossil record shows the development of life-forms that have proceeded from simple to complex over geological time. By helping to solve puzzles like this, taphonomists increase our understanding of the fossil record. The only substantial mammalian predator on Kangaroo Island, the Tasmanian devil, is known only from the fossil record. The majority of the fossil record consists of biomineralized or sclerotized remains as they have a high preservation potential. Show More Sentences Close association of shark teeth with a vertebrate skeleton is yet another type of fossil record that may indicate shark feeding. The key to understanding the early evolution of eukaryotes lies in the Proterozoic fossil record, especially microfossils. No observations from the fossil record or genomics or biogeography or comparative anatomy that undermine standard evolutionary thinking. The rest of his arguments, such as the lack of missing links in the fossil record and the evidence for a young Earth, were verifiable. But in fact, there are very distinct patterns found in the fossil record of trilobites. The Australian fossil record of monotremes also includes some quite good Miocene and Pleistocene fossils of giant echidnas. Thus, meteorites represent a fossil record of the early conditions of the solar nebula. By any measure, decapods are underrepresented in the fossil record by comparison with organisms with more heavily calcified exoskeletons. In order to obtain absolute estimates of these quantities, calibration using the fossil record is required. The major feature of the fossil record is stasis, long periods in which new species do not appear. Most populations of organisms at any given time are in stasis or genetic equilibrium, as the fossil record indicates. The dorsal carapace, as far as is known to the authors, has never been described from the fossil record. The fossil record of this family extends to the late Eocene or early Oligocene. These novel morphological approaches to the study of the ommatidia and the foregut ossicles may have limited application in the fossil record. The rich fossil record from the early Eocene Bighorn Basin includes the remains of the most ancient primates, hoofed animals, and carnivores. Because orchids are primarily tropical epiphytes and small herbs, they do not have a fossil record. The body fossil record of arthropods in the Chinle Formation is limited to beetle elytra and a few poorly preserved wings of orthopteran insects. By this type of omission, the true nature of the human fossil record continues to be the best-kept secret in modern paleoanthropology. One of the most important aspects of paleobotany is establishing relationships between the organisms that we encounter in the fossil record. The horseshoe crab goes back in the fossil record over two hundred million years without any major changes. Show More Sentences Only the most robust biominerals survive into the fossil record, and the range of isotopic systems available to study is limited. This termination may be further modified by a covering of corneous material which appears black or dark brown even in the fossil record. They are absent in the fossil record between the Early Carboniferous and the Late Permian. The largest gap in the fossil record is thought to be the evolution from prokaryote to eukaryote cells. All of this splitting is to make the human fossil record conform to the fossil record of other groups. The early history of pterosaurs is not yet fully understood because of their poor fossil record in the Triassic period. Charophytes are prone to calcification and have left an abundant fossil record up to the Cretaceous, and perhaps beyond. Charred peat surfaces have been reported in the fossil record but are absent in the K-T peat sequences. Moreover, for this phase of metazoan evolution, the fossil record is extremely poor. Their handiwork expands debate over how to identify hominid species in the fossil record. Thus their first occurrence in the fossil record is a metric of particular interest. It is commonly believed that the fossil record provides the most direct evidence for evolution. This bed is highly important because it records the first appearance of organisms with hard parts in the fossil record. Bryozoa is the only major phylum that does not have a fossil record in the Cambrian. Some paleontologists do study the fossil record of humans and their relatives. Actually the real reason there are gaps in the fossil record is because of geological changes over time. The Entoprocta is also a small phylum and the oldest fossil record is from the Upper Jurassic. The fossil record of emballonurids extends to the late Eocene or early Oligocene. Records of interspecies interaction have seldom been preserved in the fossil record. The cuticle laminations lining the counterpart obscure epibionts and reduce the resultant epibiont prevalence in the fossil record. Show More Sentences Modern cycads are tropical plants whose ancestors can be traced in the fossil record for about 300 million years. The timescale of prokaryote evolution has been difficult to reconstruct because of a limited fossil record. Other evidence for the quick deposition of sediment on organisms as seen in a great catastrophe is provided by the presence of soft-bodied organisms in the fossil record. The scarce fossil record consists of bivalve and gastropod debris. Meaningful interpretation of the fossil record thus requires the identification of contributing taphonomic pathways and their differential distribution in both time and space. The fossil record is replete with evidence supporting a plant-eating, basically frugivorous way of life for ancestral anthropoids, particularly hominoids. I challenged him specifically on the question of biostratigraphy and the successional order of appearance of the various forms of life in the fossil record. Because many of the above estimates of divergence times far exceed the times of first appearance of land plants in the fossil record, they might be overestimates. If the two species were then recovered from the fossil record, in the same relative abundances, a similar conclusion might be drawn about winter temperature. For the continental fossil record, such parameters and their evolution through time cannot be seen as a simple linear series of factors subsidiary to sea-level changes. These new finds double the age of the sparse fossil record for lorises and bushbabies, which with lemurs make up a primate group called the strepsirrhines. Mesosaur fossils appear suddenly in the fossil record, and disappear equally suddenly, and their fossils show no sign of evolution during their existence. In order to do this, paleobiologists must have an excellent fossil record of a lineage and an independent source of environmental data in the same region. Recently this pattern of dental development has been hypothesized to be a synapomorphy of metatherians, and has been used to diagnose taxa in the fossil record. In any case, no real evolutionist, whether gradualist or punctuationist, uses the fossil record as evidence in favor of evolution as opposed to special creation. Because of their ability to secrete calcium carbonate, calcareous red algae have a better Phanerozoic fossil record than many other groups of algal protists. This type of organism is very rarely preserved in the fossil record. A huge structure off of Australia's northwest coast has been identified by researchers as an ancient impact crater, and blamed for a mass extinction in the fossil record. Therefore, a long hiatus exists in the fossil record of anapsids. So even though a change from gliding to flapping might be an easy idea to swallow, neither the several independently evolved gliders nor the fossil record lend it any support. Show More Sentences The unusual change in shell coiling from dextral to sinistral during their ontogeny represents a character which makes their recognition in the fossil record easy. Many geological expeditions have explored the Antarctic Peninsula and their discoveries have filled out many of the missing gaps in the fossil record of the continent. The apparent discrepancy between divergence ages implied by genetic calibration techniques and a literal interpretation of the fossil record is discussed. In the living lobe-finned fish the tail is now symmetric, though the fossil record shows that this change happened independently in the two groups. And while jawless vertebrates were present in the Cambrian, it was not until the Ordovician that armored fish became common enough to leave a rich fossil record. Most living demosponges have skeletons of unfused spicules, although due to preservational effects, the fossil record of demosponges is mostly of fused forms. New experimental evidence on the faeces of modern fish show that faeces must be buried in less than 24 hours if they are to be preserved as coprolites in the fossil record. Choanoflagellates have no fossil record, although some marine species secrete delicate loricae, or outer coverings, made of fine, interwoven silica bars. A diverse assemblage of winged insects appears suddenly in the fossil record about 330 million years ago, and there are few clues about their evolutionary lineage. During this period all hypercarnivorous forms disappeared from the fossil record, including hypercarnivorous canids and mustelids, in addition to feliforms. Only one study to date has used calibration points from the fossil record to estimate the divergence of sister species distributed on both sides of the isthmus. Ichthyosaurs gradually disappear from the fossil record of about 90 million years ago, a full 25 million years before mass die-offs wiped out the dinosaurs. However, the paucity of modern cycad trunks to cycadeoid trunks in the fossil record suggests that the modern cycad trunks did not fossilize as readily as the extinct variety. Basically what is available in the fossil record are only hard parts-bones and teeth for vertebrates, and shells for mollusks, arthropods and echinoderms. The most direct account of our past is inferred from the fossil record. Darwin and his contemporaries first linked the hierarchical structure of the tree of life with the then very sparse fossil record. The quality of the fossil record greatly increases from 130,000 years ago onwards. From 130 ka onwards, the quality of the fossil record increases dramatically. The evolution of carnivorous plants is obscured by the paucity of their fossil record. The uncertainty surrounding tupaiid phylogeny is a consequence of an inadequate fossil record. Show More Sentences The current study adds to the fossil record two recently investigated proboscideans from Nogal, New Mexico. The protist fossil record is exquisitely detailed, allowing the authors to do exactly that. The oldest megachiropteran is dated at around 35 million years ago, but the preceding gap in the fossil record makes their true lineage unknown. But to fully understand canid history, and therefore what is happening today, we need to look back even further in time, to the fossil record. The fossil record indicates that birds emerged within theropods in the Late Jurassic. Scorpions are terrestrial chelicerates that have a fossil record extending back more than 400 million years to the Silurian Period. Coelacanths are known from the fossil record dating back over 360 million years. Hence, the fossil record is very incomplete, increasingly so as earlier times are considered. Hence, they supplement the conventional fossil record and allow the fossil ranges of many groups to be extended. The fossil record is consistent with a Cambrian explosion that was limited to the benthos, with pelagic phyla evolving much later. Around 800 million years ago, there was a notable increase in the complexity and number of eukaryotes species in the fossil record. Hence the fossil record is very incomplete, increasingly so further back in time. Although paleontology became established around 1800, earlier thinkers had noticed aspects of the fossil record. The expanding knowledge of the fossil record also played an increasing role in the development of geology, particularly stratigraphy. The genus Morus is much better documented in the fossil record than Sula, though the latter is more numerous today. The Gliridae are one of the oldest extant rodent families, with a fossil record dating back to the early Eocene. Both the fossil record and analysis of mitochondrial DNA suggest the divergence occurred by 10 to 20 million years ago. This independent evidence from DNA analysis and the fossil record rejects the glacial theory of salmon divergence. The Lepidosauromorpha, specifically the Sphenodontia, are first found in the fossil record of the earlier Carnian Age. This gap in the fossil record is called Romer's gap after the American palaentologist Alfred Romer. Show More Sentences Some fern orders such as Gleicheniales appeared as early in the fossil record as the Cretaceous, and achieved an early broad distribution. The fossil record, however, does not support this relationship, because the hippo lineage dates back only about 15 million years. The fossil record traces the gradual transition from terrestrial to aquatic life. Early fish from the fossil record are represented by a group of small, jawless, armored fish known as ostracoderms. The fossil record of the Caridean is sparse, with only 57 exclusively fossil species known. Fossil finds from North America have been meagre compared with Europe, which has a richer fossil record. The fossil record suggests that the last few million years featured the greatest biodiversity in history. The rodent fossil record dates back to the Paleocene on the supercontinent of Laurasia. Compared to other birds of prey, the fossil record of the falcons is not well distributed in time. The fossil record of snakes is relatively poor because snake skeletons are typically small and fragile making fossilization uncommon. In contrast to plants and animals, the early fossil record of the fungi is meager. The effects of mass extinctions on plants are somewhat harder to quantify, given the biases inherent in the plant fossil record. Larger animals are too scarce in the fossil record for good statistics, so paleontologists have analyzed microfossil extinctions. Even microfossil data can be unreliable if there are hiatuses in the fossil record. The fossil record indicates that birds are modern feathered dinosaurs, having evolved from theropod ancestors during the Jurassic Period. Cladistic analysis, among other modern techniques, helps to compensate for an often incomplete and fragmentary fossil record. Bioimmuration is known in the fossil record from the Ordovician to the Recent. Layered spherical growth structures termed oncolites are similar to stromatolites and are also known from the fossil record. Paleontologists examine the fossil record to understand the process of evolution and the way particular species have evolved. This shows that caseid synapsids were much more ancient than previously documented in the fossil record. Show More Sentences Because of their small size and often delicate structure, bryophytes have a poor fossil record, dating back only about 290 million years. Their predecessor, the steppe bison appeared in the North American fossil record around 190,000 years ago. The fossil record includes a progression from early biogenic graphite, to microbial mat fossils, to fossilized multicellular organisms. Here, the majority of types of modern animals appeared in the fossil record, as well as unique lineages that subsequently became extinct. This model is supported by multiple and independent lines of evidence, such as the fossil record and genetics. Bryozoans don't appear in the fossil record until after the Cambrian, in the Lower Ordovician. The earliest catarrhines in the fossil record, creatures that were neither monkey nor ape, date back to the late Eocene to early Oligocene epochs, 35 to 30 million years ago. Now, for the first time, scientists have observed the same dynamics in the fossil record, thanks to a mass extinction that decimated ocean life 360 million years ago. The fossil record of marine mammals is a little spotty during this time, and not as well known as the Eocene or Miocene, but some fossils have been found. Dating of the fossil record also is not very precise, Marshall said. The fossil record of Itea on either side of Beringia is poor. Other durable but pliable organic materials, such as protist resting cysts, are important parts of the Precambrian fossil record, up to 2 billion years old. How about the famous Dinosaur tree, or Wollemi Pine, which was rediscovered in 1994 having only appeared in the fossil record two million years ago? To date there have been two extinct species named from the fossil record. Ferns first appear in the fossil record in the early Carboniferous period. Eldredge's interpretation of the Phacops fossil record was that the aftermaths of the lens changes, but not the rapidly occurring evolutionary process, were fossilized. Just as molecular evidence from living mammals would predict, the African fossil record documents the presence of several afrotherian groups by early or middle Eocene time. He draws eclectically on studies of baboons, descriptive anthropological accounts of hunter-gatherer societies and, in a few cases, the fossil record. Eosalmo driftwoodensis, the oldest known salmon in the fossil record, helps scientists figure how the different species of salmon diverged from a common ancestor. The fossil record is also poor for moa and the aepyornid elephant birds, in that both are mainly known from remains that date from historical times. Show More Sentences These tools disappeared from the archeological record at around the same time the Neanderthals themselves disappeared from the fossil record, about 40,000 years ago. Because of the incompleteness of the fossil record, there is usually no way to know exactly how close a transitional fossil is to the point of divergence. The fossil record was one of the early sources of data underlying the study of evolution and continues to be relevant to the history of life on Earth. Based on the fossil record, the background rate of extinctions on Earth is about two to five taxonomic families of marine animals every million years. He based the proposal on the fossil record of mammals in Central America. When a relict is representative of taxa found in the fossil record, and yet is still living, such an organism is sometimes referred to as a living fossil. However, fossil evidence is scant, and only with the evolution of the diatoms themselves do the heterokonts make a serious impression on the fossil record. Interpretation is difficult due to a limited supply of evidence, based mainly on an incomplete fossil record and chemical signatures remaining in Cambrian rocks. He reasoned that earlier seas had swarmed with living creatures, but that their fossils had not been found due to the imperfections of the fossil record. Crustaceans have a rich and extensive fossil record, which begins with animals such as Canadaspis and Perspicaris from the Middle Cambrian age Burgess Shale. In general, the fossil record shows a very slow appearance of these lifeforms in the Precambrian, with many cyanobacterial species making up much of the underlying sediment. True sturgeons appear in the fossil record during the Upper Cretaceous. Further, the mineralised phyla that form the basis of the fossil record may not be representative of other phyla, since most mineralised phyla originated in a benthic setting. Marine fossils are mostly used to measure extinction rates because of their superior fossil record and stratigraphic range compared to land animals. Rates of decline in biodiversity in this sixth mass extinction match or exceed rates of loss in the five previous mass extinction events in the fossil record. The older the fossil record gets, the more difficult it is to read. The fossil record and faunal succession form the basis of the science of biostratigraphy or determining the age of rocks based on embedded fossils. The first appearance of sirenians in the fossil record was during the early Eocene, and by the late Eocene, sirenians had significantly diversified. Examples from Classical Literature The fossil record of the kangaroo rats is so scanty that one can but speculate on the evolutionary sequence. Any fossil record of Kinosternon is a welcome find, and these two specimens give new data both as to age and distribution. This is especially necessary in the early part of our ancestral tree, because the fossil record quite fails us. The fossil record is too incomplete to reveal the time when the two tribes diverged. A single toad ilium from the late Pleistocene represents the first report of the class Amphibia from the Michigan fossil record. Hicks collected the second fossil record described as from ferruginous sandstone, largely of impure, partly oolitic, limonite, considered typical of the area. Find more words! 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Words that rhyme with fossil record What is the plural of fossil record? Use our Sentence Generator Nearby Words fossilized fossilize fossilization fossilised fossilise fossilisation fossils fossil water fossor fossorial foster Foster