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Topic: Quaternary

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In the News (Sat 20 Jul 19)

  Quaternary Period - ninemsn Encarta
Quaternary Period, former division of the geological timescale, spanning the last 1.8 million years of the Earth's history, up to the present day.
The Quaternary is no longer regarded as a formal division of the geological timescale, though the term remains in common informal use.
Temperature fluctuations during the Quaternary appear to show a regular periodicity, which may be caused by cyclical irregularities in the orbit of the Earth around the Sun.
au.encarta.msn.com /encyclopedia_761567289/Quaternary_Period.html   (753 words)

 Quaternary - Wikipedia, the free encyclopedia
The Quaternary Period is the geologic time period from the end of the Pliocene Epoch roughly 1.8-1.6 million years ago to the present.
In a recent revision of the international classification of geological time periods, the Quaternary was subsumed into the Neogene.
The term Quaternary ("fourth") was proposed by Jules Desnoyers in 1829 to address sediments of France's Seine Basin that seemed clearly to be younger than Tertiary Period rocks.
en.wikipedia.org /wiki/Quaternary   (657 words)

 What is the Quaternary
The Quaternary is a subdivision of geological time (the Quaternary Period) which covers the last two million years up to the present day.
At the latitude of northwestern Europe the warmer periods are known as temperate stages (or interglacials -periods between glaciations) and the colder periods as cold stages (or glacials).
Quaternary climate change has produced a geological record dominated by sediments deposited under glacial, periglacial and temperate environmental conditions and this is, by its very nature, a fragmentary one.
qra.org.uk /what.html   (912 words)

Particularly during the late Quaternary, the influence of environmental change on humans, and the influence of humans on the environment are important themes of Quaternary Palynology.
Compared to stratigraphic palynology, Quaternary palynology is more quantitative, and unlike stratigraphic palynology, it assumes that the pollen and spores investigated are produced by living taxa (Families, Genera, or Species).
Routinely, 300 to 500 pollen grains are counted per sample, and these abundances are formally compared to vegetation and environmental properties through "surface sample studies." The assumption of "modernity" is fundamental to Quaternary palynology, because it uses the ecological tolerances of the recognized taxa to interpret past precipitation and temperature and other environmental parameters.
www.geo.arizona.edu /palynology/quat_pal.html   (612 words)

 Quaternary Geology
The Quaternary period is subdivided into the Pleistocene (“Ice Age”) and the Holocene (present warm interval) epochs, with the Pleistocene spanning most of the Quaternary and the Holocene covering the past 10 000 years.
The Quaternary period is characterized by a series of large-scale environmental changes that have profoundly affected and shaped both landscapes and life on Earth.
One of the most distinctive features of the Quaternary has been the periodic build-up of major continental ice sheets and mountain ice caps in many parts of the world during long lasting glacial stages, divided by warm episodes (interglacials) of shorter duration, when temperatures were similar to or higher than today.
www.hi.is /~oi/quaternary_geology.htm   (5409 words)

 The Quaternary Period
The Quaternary Period is most noted for its intervals of glacial and interglacial ages as well as the emergence of man. The Quaternary Period (aka the Great Ice Age) is subdivided into the Pleistocene Epoch (1.8mya-10,000 years ago) and the Holocene Epoch (10,000ya-present).
The current warm and ice free conditions of the Holocene Epoch may be a result of the end of the last glaciation or the climate may be a part of an interglaciel period.
Plant and animal life was essentially the same during the early Quaternary Period as it is today accept for the presence of the megafauna such as mastodons which have since become extinct.
www.denison.edu /biology/bio380-2001/quaternaryperiod.html   (935 words)

 Quaternary - LoveToKnow 1911
QUATERNARY, in geology, the time - division which embraces the Pleistocence and Holocene epochs, i.e.
The term was proposed by J. Desnoyers in 1829 to cover those formations which were formed just anterior to the present.
There are other ways of regarding the Quaternary time.
www.1911encyclopedia.org /Quaternary   (182 words)

 Subcomission on Quaternary Stratigraphy, ICS
As a result, the INQUA and Quaternary workers are commonly using one definition (based on Earth's major environmental changes), whereas several published time scales have implied another definition (and display an unratified placement on the geologic time scale).
That recommendation was that the Quaternary be assigned the status of a Sub-Era/Sub-Erathem with its base at the base of the Pliocene Gelasian Stage GSSP at ca.
ICS response to INQUA on the status and defuinition of the Quaternary (and the base of the Pleistocene).
www.quaternary.stratigraphy.org.uk /meetings/task.html   (1219 words)

 The Quaternary Period of the Cenozoic Era   (Site not responding. Last check: 2007-09-08)
During the early Quaternary, Europe and North America were covered by the glaciers of the Pleistocene epoch.
Retreat of the glaciers led to isostatic rebound of the crust in the Holocene.
The life of the Quaternary is marked by the rise and dominance of humans.
www.science501.com /PTQuaternary.html   (253 words)

 Quaternary Research Center
Quaternary studies focus on the processes that presently shape the natural environment and have operated over approximately the past two and a half million years (Quaternary period).
Quaternary research is typically interdisciplinary, and thus it commonly involves related interests of two or more academic units.
The Quaternary Research Center was established in 1967 to foster such interdisciplinary studies on a cooperative basis.
www.washington.edu /students/gencat/academic/quaternary.html   (669 words)

 Quaternary structure - Wikipedia, the free encyclopedia
In biochemistry, quaternary structure is the arrangement of multiple folded protein molecules in a multi-subunit complex.
In addition to the tertiary structure of the subunits, multiple-subunit proteins possess a quaternary structure, which is the arrangement into which the subunits assemble.
Enzymes composed of subunits with diverse functions are sometimes called holoenzymes, in which some parts may be known as regulatory subunits and the functional core is known as the catalytic subunit.
en.wikipedia.org /wiki/Quaternary_structure   (618 words)

 Quaternary Studies - Natural Resources Map & Bookstore
As a result, the Quaternary record is incomplete and the history must be pieced together from detailed study of the isolated outcrops that remain.
Quaternary deposits of all types are addressed to some extent, with emphasis on alluvial and eolian deposits along the northern tributaries to the San Juan River and mass movement/glacial deposits in the La Sal Mountains.
This report is one of the first attempts to map in a systematic way the Quaternary deposits and landforms in a large area of the Basin and Range physiographic province of western Utah.
www.ugs.state.ut.us /bookstore/ugs/quaterny.htm   (4404 words)

 Quaternary Geology
The Quaternary period is the time of development of many details of the landscape and of all the surficial deposits.
The Quaternary Geology datalayer illustrates the geologic history and distribution of depositional environments during the emplacement of glacial and postglacial surfical deposits and the landforms resulting from those events.
The Quaternary Geology datalayer is complemented by the Surficial Materials datalayer, which is based on the 1:24,000-scale compilation sheets for Surficial Materials Map of Connecticut (Stone and others, 1992).
dep.state.ct.us /gis/dataguides/usgs/layers/quatgeol.htm   (705 words)

 Rockaway River Area Aquifer System ( Unconsolidated Quaternary )
The Unconsolidated Quaternary Aquifer System (Rockaway River Drainage Basin) is situated partly in the New Jersey Highlands section of the New England physiographic province and partly in the Piedmont province.
The Quaternary deposits in the area include ground moraine, terminal moraine, Wisconsin stratified drift, older stratified drift from the Kansan or Illinoian stages, and alluvium.
For the bulk of the Quaternary deposits, recharge is from precipitation on the outcrop areas (Gill and Vecchioli, 1965).
www.epa.gov /region02/water/aquifer/rock/rockaway.htm   (4126 words)

 Strata of Quaternary Age, Kentucky Geological Survey site   (Site not responding. Last check: 2007-09-08)
Quaternary (1.6 million years ago to today) sediments are the youngest deposits in Kentucky and are mostly restricted to the floodplains of rivers and creeks.
Quaternary sediments consist mostly of silts, sands, gravel and clay eroded from Paleozoic rocks exposed at the surface in Kentucky.
Many varieties of igneous (e.g., granite, basalt), metamorphic (e.g., quartzite, schist) and sedimentary rocks not normally occurring in Kentucky were deposited in the Quaternary sediments and as isolated rocks and boulders, which are called erratics.
www.uky.edu /KGS/geoky/quaternary.htm   (238 words)

 Amazon.ca: Quaternary Dating Methods: Books: Mike Walker   (Site not responding. Last check: 2007-09-08)
The Quaternary is the most recent major subdivision of the geological record, covering the last 2.5 million years or so of earth history and extending to the present day.
Quaternary Dating Methods describes the different techniques that can be employed to establish a Quaternary timescale, and shows the wide range of contexts in which these can be applied.
The book begins with a review of the history of Quaternary dating from the early attempts based on biblical genealogies to recent developments involving radiometric methods.
www.amazon.ca /Quaternary-Dating-Methods-Mike-Walker/dp/0470869267   (492 words)

 INQUA - the International Union for Quaternary Research
The Quaternary is an interval with dramatic and frequent changes in global climate.
The expertise of Quaternary scientists is to interpret the changing world of the glacial ages and their impact on our planet's surface environments.
Quaternary palaeoclimatic investigations play a key role in the understanding of the possible future climate change on our planet.
www.inqua.tcd.ie   (166 words)

Quaternary Research is the study of the interval of Earth's geologic history that spans approximately the last two million years, and includes the Pleistocene and the Holocene.
Quaternary researchers study lake sediments, ocean sediments, ocean circulation, ice cores, cycles of the earth/sun, atmosphere, fossil and modern animals and plants including invertebrates, vertebrates, insects, and pollen, and other subjects.
The 1st Symposium on the Quaternary was organized by the Brazilian Geological Society (SBG) in conjunction with the XXV Brazilian Congress of Geology held in 1971.
www.library.uiuc.edu /gex/bibs/QuaternaryInformationResources.html   (7572 words)

 Quaternary Palaeoenvironments Group (QPG)
Understanding this period, the Quaternary, is the central focus of research in the Quaternary Palaeoenvironments Group (QPG).
Quaternary stratigraphy (of glacial, terrestrial, fluvial and marine sediments)
Drawings of the Quaternary of the North-east coast of Norfolk.
www-qpg.geog.cam.ac.uk   (759 words)

 Royal Alberta Museum: Collections and Research: Quaternary Paleontology
Quaternary Paleontology is the study of fossil organisms that lived during the last 1.8 million years, a block of time that is conventionally divided into the Pleistocene Epoch (the "Ice Age") and the Holocene Epoch, or postglacial period (the last 10,000 years).
Many Quaternary "earth scientists" believe that the division of Pleistocene and Holocene epochs is arbitrary, and that we are currently living in a warm, interglacial interval of the continuing Pleistocene: they say that more ice is on the way!
This is conveniently within the range of radiocarbon dating, the major tool used to determine the timing and sequence of glacial and biological events of the late Quaternary.
www.royalalbertamuseum.ca /natural/paleo/intro.htm   (306 words)

 South Carolina Quaternary Geologic Framework - Discussion & Conclusions
The Quaternary stratigraphy within the study area can be divided into two sedimentary units: (1) late Pleistocene with at least three stratigraphic sequences and (2) Holocene with only a transgressive portion of a sequence.
The Quaternary sediments prism thins seaward, from approximately 6 meters immediately offshore of the barrier islands, to negligable thickness in about 16 meters water depth.
The bathymetry as well as the Pleistocene erosional surface is influenced by the presence of older incised channels running normal to the modern shoreline.
coastal.er.usgs.gov /scerosion/quaternary/discuss.html   (541 words)

 Geological Society - Group Details - Quaternary Research Association
Quaternary Research Association was founded in 1964 as the Quaternary Field Study Group.
Its name was changed to the Quaternary Research Association in 1968.
The QRA is an organisation comprising archaeologists, botanists, civil engineers, geographers, geologists, soil scientists, zoologists and others interested in research into the problems of the Quaternary.
www.geolsoc.org.uk /template.cfm?name=Quaternary_Research_Association   (161 words)

 Cambridge Quaternary
The Quaternary, the last 2.6 million years of geological time, saw major climatic changes which caused ice sheets to advance intotemperate latitudes.
Cambridge Quaternary is a semi-informal research group of approximately 60 people within the University of Cambridge.
New Quaternary institute established at the University of Manchester.
www.quaternary.group.cam.ac.uk   (593 words)

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