How to use Eocene in a sentence

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Sentence Examples This age is notable because it is precisely the age of the boundary between the Paleocene and Eocene epochs. Furthermore, physical damage was not an important cause of arm injury when the ophiuroids and crinoids were alive in the late Eocene. The syn-rift succession overlies Eocene to Oligocene pre-rift strata with an angular unconformity. Nevertheless, subduction of Africa beneath Iberia starting in the Late Eocene has been proposed. In addition, a drastic decrease in subsidence rates before the onset of the Late Eocene Pyrenean inversion was determined. Eocene formations are important source or reservoir rocks for petroleum or gas in several parts of the world. Paleocene and Eocene sediments were deposited on a polygenetic sub-Paleogene surface. The skeletal morphology of monticular zooids in H. portelli suggests that specialized male polymorphs may not have evolved by Late Eocene times. The La Meseta Formation is the best exposed and most fossiliferous rock unit of Eocene age in Antarctica. The fossil record of emballonurids extends to the late Eocene or early Oligocene. Trunk and limb proportions of early middle Eocene Rodhocetus are most similar to those of the living, highly aquatic, foot-powered desmans. Our analysis of dissected stems and the outer anatomy of fossil logs indicates that the Eocene Metasequoia were strongly self-pruning. It includes the Palaeocene, Eocene, and Oligocene epochs, spanning the time from the end of the Mesozoic to the beginning of the Neogene. Clearly, the late Eocene ophiuroids and crinoids experienced little physical damage and limited predation pressure. An early Cretaceous to late Eocene volcanic arc was located in the present-day Central Depression. The long Eocene epoch witnessed only four independent first appearances of gastropods with a labral tooth. During the Eocene, this region was located at much the same latitude it is today, though global climate was more equable. The first horse, Hyracotherium, is known from the early Eocene and appears to have been derived from a condylarth. However, there seems to be a marked age gap between the Cretaceous ages and onset of rifting in the Eocene. The bulk of the sediments on the outer margin are of Eocene to Oligocene age with thin units of younger sediments on top. Show More Sentences Their adaptive radiation occurred in the Eocene when palms, figs, lipid-rich laurels, and other extant families were prominent. All the small zygodactyl or semizygodactyl forms, generally from Eocene deposits, are jumbled together in the family Zygodactylidae. The Lower Eocene Sulov Basin close to the Pieniny Klippen Belt is a kilometre-thick pile of dolomite gravel, rapidly deposited in a fan. By the end of the Eocene, modern orders and families replaced the archaic fauna of mostly extinct groups with no living descendants. To my knowledge, no herbivorous marine fish families have been recorded prior to the Eocene. The balloon vines are a common feature of the Green River, Florissant, and Ruby floras of the Eocene. This pattern was documented for both bivalves and gastropods and continued from the mid to late Paleocene until the early Eocene. Eocene uintatheres sported several blunt pairs of horns that were probably covered by skin. During the Mid-Eocene the tilting became smoother and more uniform compared with the Early Eocene. Studies have shown that fossil discoveries can date the snake mackerel back to the Eocene era. Fossils of volant paleoganthous carinate birds from the Paleocene and Eocene appear phenetically most similar to tinamiform birds. They found that the Eocene nummulites lived in nutrient-rich environments during a warm climatic phase. Likewise, I found no increase in gastropod richness from the Campanian to the Eocene. These analyses find a significant decrease in rarefied-sample species richness from the Campanian through the Eocene, but no change in evenness. The oreodonts, sheep-like artiodactyls from the Eocene and Oligocene, were among these early artiodactyls. The fossil record of this family extends to the late Eocene or early Oligocene. The rich fossil record from the early Eocene Bighorn Basin includes the remains of the most ancient primates, hoofed animals, and carnivores. Cooling in the late Eocene was thus the beginning of a long-term shift from the cool-temperate climate of the Eocene to the glaciated, polar climate found in Antarctica today. This clast can be lithologically attributed to the Upper Metamorphic Unit, but the Eocene age obtained on this rock has not been found in samples in situ. No mammal of today has a comparable anatomy of the limbs, but several extinct groups like the Eocene to Pleistocene chalicotheres show similar adaptations. Show More Sentences In 1977, Wes and 1 rediscovered a fossil-rich Eocene lakebed in the small northeastern Washington town of Republic by kicking over a stone at the edge of the main street. Western Ecuador consists of a complex tectonic melange of oceanic terranes accreted to the continental margin from Late Cretaceous to Eocene time. At least two Eocene feldspar porphyry dykes or sills intrude Tsa da Glisza, and appear to have followed the same planes of weakness as the aplite dykes. We discuss the implications of these findings in the context of major evolutionary events in the history of these sand dollars from the Eocene to the present. Most perissodactyl lineages went extinct in the late Eocene or Oligocene. These fossils are from a time when the warm equable climate of the early Eocene was changing to the cooler more seasonal climates that we know today. In the North Pacific, most invaders during the late Eocene to early Oligocene spread from west to east, from East Asia to the west coast of North America. Primates, insectivores, and condylarths are recognized by the beginning of the Cenozoic, and by the start of the Eocene, most modern groups had become established. This morphological signal also appears to persist, with the rabbitfishes, surgeonfishes, damselfishes, and scats already occupying this space in the Eocene. First small ocean basins opened and a shallow gateway appeared during the Middle Eocene. The Oligocene is preceded by the Eocene Epoch and is followed by the Miocene Epoch. Similarly, molossid bats may have reached South America from Africa in as many as five dispersals, starting in the Eocene. Other similar basal primates were widespread in Eurasia and Africa during the tropical conditions of the Paleocene and Eocene. Whales direct lineage began in the early Eocene, more than 50 million years ago, with early artiodactyls. Eocene fossil fish Priscacara liops from the Green River Formation of Wyoming. Eocene fossil flower, collected August 2010 from Clare family fossil quarry, Florissant, Colorado. Almost every type of rock known from the Early Jurassic to the Eocene epochs can be found in the county. They separated from other crocodilians during the Eocene epoch, about 55 million years ago. The Gliridae are one of the oldest extant rodent families, with a fossil record dating back to the early Eocene. Since the late Eocene, about 40 million years ago, cetaceans populated the subtropical oceans and no longer emerged on land. Show More Sentences Palaeotis and Remiornis are birds from the Middle Eocene also cited as potential early ostriches. The earliest unequivocal fossils of auks are from the late Eocene, some 35 mya. In the Eocene, slender chocropotamids belong to this group, which display a tendency to elongate the skull and molarize the premolars. We recently proposed a new genus of Thorny Lacewing from the Eocene amber of France. These are followed in the Upper Eocene by the genus Amynodon, in which the skull assumes more distinctly the rhinocerotic type. The oldest alcid fossil is Hydrotherikornis from Oregon dating to the Late Eocene while fossils of Aethia and Uria go back to the Late Miocene. Rodents greatly diversified in the Eocene, as they spread across continents, sometimes even crossing oceans. Beavers appeared in North America in the late Eocene before spreading to Eurasia. A series of Early Eocene sites collectively called the Okanagan Highlands also fits this description well. Ingles M, Anadon P Relationship of clay minerals to depositional environment in the non-marine Eocene Pontils Group, SE Ebro Basin. The exposure of this group ranging in time from Palaeocene to upper Eocene. The occurrence of the sand dollar echinoid Periarchus lyelli in the Upper Eocene Caddell Formation of Texas is confirmed. Stratigraphy and paleomagnetism of the upper middle Eocene to lower Miocene Sespe Formation, Ventura County, California. Barytherium is a genus of an extinct family of primitive proboscidean that lived during the late Eocene and early Oligocene ages in North Africa. Genetic evidence indicates that megabats originated during the early Eocene and should be placed within the four major lines of microbats. Morphogenesis of the specialized peridermal tissues in Decodon allenbyensis from the middle Eocene Princeton Chert. The Upper Eocene consists of greenish marlaceous clays with silicon sandstone inter-layers, foraminifers, shales of ostracordes and the teeth of fish. This species is large compared with known Eocene alligatorids, although its character states present a mosaic of resemblances to earlier and later alligatorids. Eocene foraminiferans are very different from Pliocene ones, and even within the Eocene there are many fine time divisions that can be recognised using foraminifera. Like the vast majority of rhinoceroses, the body plan of the woolly rhinoceros adhered to a conservative morphology, like the first rhinoceroses seen in the late Eocene. Show More Sentences This period consists of the Paleocene, Eocene, and Oligocene epochs. The first appearance of sirenians in the fossil record was during the early Eocene, and by the late Eocene, sirenians had significantly diversified. The first members of Dugongidae appeared by the end of the Eocene. Pinnipeds split from other caniforms 50 mya during the Eocene. The Oligocene is often considered an important time of transition, a link between the archaic world of the tropical Eocene and the more modern ecosystems of the Miocene. 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. It appears, however, to have been partly derived from older Eocene deposits and it occurs also as a derivative phase in later formations, such as glacial drift. The Purbeck Ball Clay contains kaolinite and mica, showing that in the Lutetian stage of the Eocene water from a granite area, probably Dartmoor, flowed into the River Solent. The Eocene bats Icaronycteris and Palaeochiropteryx had cranial adaptations suggesting an ability to detect ultrasound, implying they used echolocation. In the western area, volcanic breccia and layers of ash indicate widespread volcanism during the Eocene, which coincides with the formation of volcanic rocks onshore. The first passerines are now thought to have evolved in the Southern Hemisphere in the late Paleocene or early Eocene, around 50 million years ago. This split started in the Eocene and accelerated during the Oligocene. Puerto Rico is composed of Cretaceous to Eocene volcanic and plutonic rocks, overlain by younger Oligocene and more recent carbonates and other sedimentary rocks. South of this, the Central Range fold and thrust belt consists of Cretaceous and Eocene sedimentary rocks, with Miocene formations along the southern and eastern flanks. In during of tectonic evolution of Lut block margin from Eocene until now a new accretionary prism as Nehcomplex has jointed to the other old terrene. The study area is geologically covered by Deccan trap rocks from the Cretaceous to the lower Eocene age, consisting of amygdaloidal and vesicular basalts. A small new species of the anthracotheriid artiodactyl genus Heptacodon is described from the middle Eocene Yegua Formation from a site near Lovelady, Houston County, Texas. 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. Eocene echinoids, the Suwannee Strait, and biogeographic taphonomy. 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. Show More Sentences The area is underlain by the flat-lying Miocene age Browns Park Formation which unconformably overlies the Eocene Green River and Wasatch Formations. Examples from Classical Literature Traces of glacial conditions have also been met with in the Eocene and Miocene. The artiodactyl group must have quickly branched in turn, as we find very primitive hogs and camels before the end of the Eocene. The granite, which is intruded through the Eocene beds, is associated with a pegmatite containing tourmaline and cassiterite. Marls and limestones with fossils of an Eocene facies overlie the Cretaceous rocks on the Gabun. The Eocene includes a series of sandstones and marls with lignite, and these are overlaid by nummulite limestones. Specially interesting in the Eocene and Oligocene are the mammalian remains. Upon this foundation rests unconformably a series of marls and limestones of Eocene and early Oligocene age. They both date from the Eocene, and became extinct in the succeeding Oligocene. In the Lower Eocene are found the remains of a diminutive ungulate, of the stature of a moderately-sized dog. They had a place in the Eocene and Miocene forests of the old world and new. The Eocene sea however cannot have been much inferior in extent. But the mammals are the most interesting vertebrates of the Eocene period. The results of the struggle are registered in the Eocene rocks. Primitive weasels, civets, and hyaenas appear also in the Eocene. Source rocks are coaly and organic-rich claystones of Eocene to Middle Miocene. The epoch following on after the Eocene is designated as the Miocene. Species much like Rhinobatus occur in the Cretaceous and Eocene. In North America, two genera and six species of palaeopheid snakes are known from Gulf Coast and Atlantic coastal Eocene marine or marine-influenced sediments. Find more words! 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