How To Use Eocene In A Sentence
-
The first cycle initiated in the early Paleocene and represents a transition from Cretaceous marine turbidites and shales to subaerial fluvial sandstones and conglomerates.
-
More specifically, there are Triassic, Jurassic, Cretaceous, Eocene, and Miocene marine and Oligocene and Plio-Pleistocene nonmarine sedimentary rocks.
Santa Monica Mountains (Bailey)
-
The sediments comprise silts, sand, gravel and, often lenticular, silty clay, comparable with similar sediments in the Petrockstowc basin, where the bulk of the deposits are Eocene.
-
The nominated area contains most of the key interrelated and interdependent elements in their natural relationships which provide a robust foundation for reconstructing the mosaic of paleoenvironments and palaeogeography of a southern coastal realm of the ancient Tethyan Ocean during Eocene time, enabling interpretation of how animals then lived and how they were related to each other.
Wadi Al-Hitan (Whale Valley), Egypt
-
The bulk of the sediments on the outer margin are of Eocene to Oligocene age with thin units of younger sediments on top.
-
Post-Jurassic mammal-like reptile from the Palaeocene.
Archive 2006-05-01
-
By the end of the Eocene, modern orders and families replaced the archaic fauna of mostly extinct groups with no living descendants.
-
The skeletal morphology of monticular zooids in H. portelli suggests that specialized male polymorphs may not have evolved by Late Eocene times.
-
Also, other microfossils such as diatoms, radiolaria, and planktonic and benthic foraminifera are useful in certain parts of the Palaeocene.
-
Some 55 million years ago, during a period called the Palaeocene-Eocene thermal maximum, the average temperature increased by 13 degrees over 10,000 years.
New Bork, New York
-
During the late Paleocene thermal maximum, the upwelling of low-oxygen intermediate Tethyan water into the epicontinental basin led to enhanced biological productivity and anoxia at the seafloor.
Bürger and Cubasch: Are multiproxy climate reconstructions robust? « Climate Audit
-
The fossils of the westernmost exposures of the Hoko River Formation are allochthonous, preserved in reworked concretions within conglomerates that were deposited as part of a submarine fan system during late Eocene time.
-
But in the middle Tertiary the mammal brain began suddenly to enlarge, so that in our time the brain of the horse is more than eight times the size of the brain of his progenitor, the dinoceras of Eocene times.
Time and Change
-
The early Eocene is important for another reason: many orders of fossil mammals (especially primates, perissodactyls, artiodactyls, rabbits, whales, and bats) make their first appearances in the fossil record.
-
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.
-
Nevertheless, subduction of Africa beneath Iberia starting in the Late Eocene has been proposed.
-
In the Southern Hemisphere a different, more strongly digitate type of Ginkgo leaf persists into the Eocene, but we lack data on its occurrence and do not discuss it further here.
-
Cheney and Hayman challenge the popular notion that Eocene crustal extension formed the so called Chiwaukum graben, in which the non-marine, arkosic Chumstick Formation reputedly was deposited during faulting.
EurekAlert! - Breaking News
-
But still later he repeats the assertion of the Eocene ( "Oligocene") age of the Santo Domingo beds in sueh a categorical manner as to demand an equally pointed refutation,! the more especially since Mr. Conrad is the oldest and best infonned of the authorities on the American Tertiaries.
Transactions of the American Philosophical Society
-
Fossils of volant paleoganthous carinate birds from the Paleocene and Eocene appear phenetically most similar to tinamiform birds.
-
Paleocene fossil outcrops abound in the glauconite rich gray clay substrata of the creek banks exposed beneath the deep rich surface soils.
-
They found that the Eocene nummulites lived in nutrient-rich environments during a warm climatic phase.
-
Some mammal teeth from the Paleocene of France show characters of both bats and insectivores (the group including the hedgehogs, shrews and moles of today).
-
Eocene a great upheaval occurred; there were foldings and crumplings, igneous rock was thrust into the distorted mass, and the islands were considerably elevated above the sea.
The Bontoc Igorot
-
This subsection contains mainly Mesozoic granitic and mafic plutonic rocks, Jura-Triassic volcanic rocks, Pre-Cretaceous metamorphic rocks, and Eocene and Oligocene marine and nonmarine and Miocene marine sedimentary rocks.
Coastal Hills (Bailey)
-
Initiation of a cold, upwelling current off the west coast of South America dates back to latest Cretaceous to earliest Palaeocene times.
-
The family exhibited a Tethyan distribution, dispersed among epicontinental Europe, the Atlantic and Gulf Coastal Plain of North America, Africa, and the Tethys during the Eocene.
-
The strata next below the Pleistocene gravels and cave deposits are ascribed to the "Pliocene age" -- older than these are the "Miocene" and the "Eocene," and then you come to the Chalk, a good white landmark separating newer from older strata.
More Science From an Easy Chair
-
The two living seriema species are South American, but members of similar, closely related groups (the bathornithids and idiornithids) inhabited North America from the Eocene to the Miocene and Europe from the Eocene to the Oligocene.
Terror birds
-
The first cycle initiated in the early Paleocene and represents a transition from Cretaceous marine turbidites and shales to subaerial fluvial sandstones and conglomerates.
-
Their adaptive radiation occurred in the Eocene when palms, figs, lipid-rich laurels, and other extant families were prominent.
-
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.
-
No mammal of today has a comparable anatomy of the limbs, but several extinct groups like the Eocene to Pleistocene chalicotheres show similar adaptations.
-
During the Mid-Eocene the tilting became smoother and more uniform compared with the Early Eocene.
-
This subsection contains mainly Mesozoic granitic and mafic plutonic rocks, Jura-Triassic volcanic rocks, Pre-Cretaceous metamorphic rocks, and Eocene and Oligocene marine and nonmarine and Miocene marine sedimentary rocks.
Coastal Hills (Bailey)
-
The Tertiary sedimentary rocks are Eocene, Oligocene, Miocene, and Pliocene.
Santa Cruz Mountains (Bailey)
-
Our analysis of dissected stems and the outer anatomy of fossil logs indicates that the Eocene Metasequoia were strongly self-pruning.
-
Most perissodactyl lineages went extinct in the late Eocene or Oligocene.
-
Particularly important for British landscape development was rifting of the Greenland-European plate in the early Paleocene.
-
However, there seems to be a marked age gap between the Cretaceous ages and onset of rifting in the Eocene.
-
The rich fossil record from the early Eocene Bighorn Basin includes the remains of the most ancient primates, hoofed animals, and carnivores.
-
Flysch, representing both the Cretaceous and Eocene systems, is widely distributed.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"
-
The syn-rift succession overlies Eocene to Oligocene pre-rift strata with an angular unconformity.
-
Since the fossils of different periods lie at different levels they are valuable indicators of palaeogeologic and palaeoecologic conditions, Eocene life, and the evolution of marine mammals.
Wadi Al-Hitan (Whale Valley), Egypt
-
The last time the world experienced temperature rises of this magnitude was 55 million years ago, after the so-called Palaeocene-Eocene Thermal Maximum event.
New Scientist - Online News
-
Indeed, Garzanti & Van Haver also observed that most of post-Eocene sediments were made of detritus from granitoid rocks.
-
The Lower Eocene Sulov Basin close to the Pieniny Klippen Belt is a kilometre-thick pile of dolomite gravel, rapidly deposited in a fan.
-
Correlated with this diet is the evolution of selenodont molar teeth - teeth with crescent-shaped ridges - for more efficient grinding of plants, as seen in this picture of Eocene artiodactyl teeth.
-
Previous research into this period, called the Palaeocene-Eocene Thermal Maximum, or PETM, estimates the planet's surface temperature blasted upwards by between five and nine degrees Celsius (nine and 16.2 degrees Fahrenheit) in just a few thousand years.
Climate Ark Climate Change & Global Warming RSS Newsfeed
-
The seismic reflector at the base of the Balder Formation follows a regional unconformity surface, which records erosion of a major branching drainage network into the underlying Palaeocene section, following a major base level fall.
-
Any of various extinct ungulate mammals of the Eocene to Pleistocene epochs, having distinctive three-clawed, three-toed feet.
-
This was rapidly followed by diversification of the superfamilies, and from our analyses it seems evident that extant bat families appear to have radiated fairly rapidly, with all families having evolved before the late Eocene.
-
All the small zygodactyl or semizygodactyl forms, generally from Eocene deposits, are jumbled together in the family Zygodactylidae.
-
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.
-
In the north Gjallar Ridge, fault patterns above the dome suggest activity before Paleocene time.
-
Present along the surface exposures of the anticline are rocks dating from Upper Cretaceous to Paleocene age.
-
Two new species from Lutetian (middle Eocene) rocks of Egypt, Protocetus atavus and Eocetus schweinfurthi, were described by Eberhard Fraas in that year.
Archive 2006-02-01
-
During the Eocene, this region was located at much the same latitude it is today, though global climate was more equable.
-
Technical details of the molar cusps and roots, and the tooth count, better match those of dryolestoids more than docodonts, and in fact Reigitherium appears particularly closely related to the Palaeocene dryolestoid Peligrotherium, with both being united by Rougier et al. (2003) in the dryolestoid clade Reigitheriidae.
Archive 2006-05-01
-
These showed an evolution of increasing diversity through to the Eocene.
-
Currano and her colleagues found that during the comparatively cooler end of the Paleocene epoch, 15 to 38 percent of leaves showed insect damage.
-
More specifically, there are Cretaceous, Eocene, Miocene, and Pliocene marine and Oligocene and Plio-Pleistocene nonmarine sedimentary rocks.
Simi Valley - Santa Susana Mountains (Bailey)
-
Archaic ungulates (‘condylarths’) were long known to be among many eutherians to make their first appearance and proliferate in the Paleocene.
-
Paleocene faunas were dominated by what we refer to as archaic mammals: condylarths (archaic ungulates), archaic primates, small rodent-like multituberculates, pantodonts, and others.
-
The long Eocene epoch witnessed only four independent first appearances of gastropods with a labral tooth.
-
Alvarenga & Höfling (2003) grouped phorusrhacids into five subgroups; the small, gracile psilopterines, known from the Palaeocene to the Pliocene and including the oldest of all phorusrhacids; the mid-sized, shallow-skulled, gracile-legged mesembriornithines of the Miocene-Pliocene; the mid-sized patagornithines of the Oligocene, Miocene and Pliocene; the gigantic, robust brontornithines of the Oligocene and Miocene; and the mostly large, gracile-legged phorusrhacines of the Miocene, Pliocene and Pleistocene.
Archive 2006-10-01
-
Eocene uintatheres sported several blunt pairs of horns that were probably covered by skin.
-
But the Miocene and Eocene periods were certainly warm, and these alpine plants could hardly have migrated over tropical forest lands, while it is very improbable that if they had been isolated at so remote a period, exposed to such distinct climatal and organic environments as in Madagascar and Abyssinia, they would have in both places retained their specific characters unchanged.
Alfred Russel Wallace: Letters and Reminiscences, Vol. 1
-
Paleocene and Eocene sediments were deposited on a polygenetic sub-Paleogene surface.
-
The Dezful embayment was a sedimentary basin with pronounced subsidence where thick late Eocene-Recent deposits were formed.
-
Sand-rich turbidites from two Palaeocene submarine fan systems have very different heavy mineral stratigraphic styles.
-
Thick Permian to Cretaceous continental rise deposits merge southward into a continuous Ordovician to Eocene shelf sedimentary succession of marine carbonate, sandstone, siltstone and shale.
-
Echinoids are among the most conspicuous and diverse constituents of the Upper Cretaceous and Paleocene marine invertebrate fauna of Argentina.
-
Furthermore, physical damage was not an important cause of arm injury when the ophiuroids and crinoids were alive in the late Eocene.
-
The first horse, Hyracotherium (= Eohippus), is known from the early Eocene and appears to have been derived from a condylarth.
-
Cretaceous and lower Palaeocene sediments partly covered by Palaeocene-Eocene picritic and basaltic lavas are exposed in the Nuussuaq Basin on the island of Disko and the peninsulas of Nuussuaq and Svartenhuk.
-
This order, which includes lemurs, monkeys, apes, and man, seems to have sprung from a creodont or insectivorous ancestry in the lower Eocene.
The Elements of Geology
-
Given that a few other Eocene European tetrapods have been suggested to be particularly closely related to South American taxa (namely the ratite Palaeotis, the peradectine opossums and the supposed anteater Eurotamandua), Ameghinornis and Aenigmavis were thought to perhaps indicate that phorusrhacids had originated in Europe and later spread (via Africa) to South America (Peters & Storch 1993).
Archive 2006-11-01
-
After previously reading the reliable not "cryptid" information that the 18th century French "Beast of Gevaudan" attacks were potentially caused by miraculously late-surviving Eocene predators called mesonychids, such as Andrewsarchus, I featured this in July.
Beast of Gevaudan - A Hyena?
-
The Eocene London Clay is a succession of marine silty clays, clayey and sandy silts, and subordinate sands reaching a thickness of over 165 m on the Isle of Sheppey, Kent, UK.
-
Mid-Cretaceous faulting is observed along the Ran ridge, whereas the axis of the Paleocene rifted zone is shifted slightly further to the west in the Voring margin.
-
The most controversial of these ‘Mesozoic survivors’ is a diminutive and enigmatic animal from Upper Palaeocene North America: Chronoperates paradoxus, described by Fox et al. (1992) for a partial mandible and some isolated teeth from the Paskapoo Formation of Alberta.
Archive 2006-05-01
-
The petrology of British Palaeocene igneous rocks shows that the asthenosphere was unusually hot and that the lavas were produced by fractional crystallization of larger volumes of melt near the Moho.
-
The topography of the unconformity includes a northward-draining valley network interpreted to represent incision into the underlying Palaeocene section.
-
This pattern was documented for both bivalves and gastropods and continued from the mid to late Paleocene until the early Eocene.
-
Clearly, the late Eocene ophiuroids and crinoids experienced little physical damage and limited predation pressure.
-
The higher elevations of the Nicobars often contain serpentine and gabbro formations, whereas at lower elevations Eocene sediments (sandstones, shales, and siltstones) with ultrabasic igneous intrusions predominate.
Nicobar Islands rain forests
-
During the late Cretaceous and early Paleocene periods plant-eating mammals were frugivores, presumably because fruit can be more easily processed than foliage.
-
Fossils of volant paleoganthous carinate birds from the Paleocene and Eocene appear phenetically most similar to tinamiform birds.
-
Protocetidae are middle Eocene in age (Lutetian-Bartonian, 49-37 Ma), and comprise fifteen genera and 16 species that range from South Asia and Africa to North America
PLoS ONE Alerts: New Articles
-
This trend is evident at a coarse scale in a comparison of the combined rarefaction curves for sites from the uppermost 15 m of the Cretaceous against all Paleocene sites.
-
During the Paleocene, almost all of the decapod occurrences were in fine siliciclastic sediments.
-
Terrestrial deposits contain fossils ranging from Paleocene leaf imprints to Cretaceous dinosaur remains.
-
Paleocene faunas were dominated by what we refer to as archaic mammals: condylarths (archaic ungulates), archaic primates, small rodent-like multituberculates, pantodonts, and others.
-
The oldest named peccary is Egatochoerus* from the Upper Eocene of Thailand (Ducrocq 1994), and similarly-aged taxa are known from southern China.
Archive 2006-08-01
-
Trunk and limb proportions of early middle Eocene Rodhocetus are most similar to those of the living, highly aquatic, foot-powered desmans.
-
The current study reports on new neoplagiaulacid multituberculates from the Paleocene Paskapoo Formation of central Alberta, Canada, at localities along the Blindman River near the City of Red Deer.
-
This morphological signal also appears to persist, with the rabbitfishes, surgeonfishes (Acan - thuridae), damselfishes, and scats already occupying this space in the Eocene.
-
Eocene formations are important source or reservoir rocks for petroleum or gas in several parts of the world.
-
The La Meseta Formation is the best exposed and most fossiliferous rock unit of Eocene age in Antarctica.
-
In addition, a drastic decrease in subsidence rates before the onset of the Late Eocene Pyrenean inversion was determined.
-
The placement and orientation of these fossils also tells researchers about the conditions at Green River during the Eocene .
-
At present, the oldest reliable fossil from this family is a tarsometatarsus that was found in Colorado, dating back to the Paleocene epoch.
-
But how about the preëxisting germs or vital units of the mastodon, the megatherium, and other gigantic mammiferous quadrupeds of the Eocene period?
Life: Its True Genesis
-
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.
-
As the seismic data demonstrate, the Eocene deformation, which is characterized by the continuous doming of the Early Tertiary High relative to the Voorne Trough, was accompanied by reverse reactivation of major Mesozoic faults.
-
An Eocene peccary from Thailand and the biogeographical origins of the artiodactyl family Tayassuidae.
Archive 2006-08-01
-
Nearly 65% is part of the Palaeocene and Pleistocene Solimões Formation, a very extensive sedimentary deposit composed of table uplands which form barriers to the drainage.
Jaú National Park, Brazil
-
Before and after the late Paleocene thermal maximum, upwelling and biological productivity were less intense, and seafloor dysoxia was restricted to neritic parts of the basin.
Bürger and Cubasch: Are multiproxy climate reconstructions robust? « Climate Audit
-
The difference between plant response to the Paelocene-Eocene warming and to the last deglaciation suggests that vegetation can't always respond quickly.
-
Both polar and Tethyan dispersal routes have been well documented for Cretaceous and Paleocene decapod crustaceans.
-
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.
-
In the Mesozoic, and into the Paleocene, limestone and dolomite interbedded with shale, clay and anhydrite prevailed in a more restricted, shallow marine to lagoonal environment.
-
In the Mesozoic, and into the Paleocene, limestone and dolomite interbedded with shale, clay and anhydrite prevailed in a more restricted, shallow marine to lagoonal environment.
-
Sand-rich turbidites from two Palaeocene submarine fan systems have very different heavy mineral stratigraphic styles.
-
This differs chiefly from Lyell's classification in the introduction of the term Oligocene for the upper part of the original Eocene, which was somewhat unwieldy.
The Antiquity of Man
-
Wadi Al-Hitan with its excellent preservation and abundance of coastal to marine fossil record and sedimentary facies provides an outstanding window on Eocene life evolution and palaeogeography comparable and complementary to Messel Pit Fossil Site in Germany with its dominantly terrestrial record.
Wadi Al-Hitan (Whale Valley), Egypt
-
Origin of whales in epicontinental remnant seas: new evidence from the Early Eocene of Pakistan.
Archive 2006-02-01
-
Other formations within the Park include the older Palaeocene Prosperança and Trombetas formations, which underlie 17% and 8% of the Park respectively.
Jaú National Park, Brazil
-
It will be an essential reference for those working on Eocene and Tertiary floras, and is a sobering reminder to those of us who work on modern woods how difficult fossil woods are to prepare and identify.
-
Its remains were found in Early Eocene London Clay deposits dated at about 55.4 million years old.
SPIX'S MACAW: THE RACE TO SAVE THE WORLD'S RAREST BIRD
