Glaciations PowerPoint PPT Presentations

... the 'Varanger' glaciation we have the first appearance of putative metazoans. How do we know there were glaciations in the Precambrian? ...

Precession (related to direction of the spin axis) modifies the relationship ... the sun every half precession cycle the hemisphere with the greatest degree of ...

Three major glacial episodes (Ice-houses) Polar Position Hypothesis: Glaciations ... On Land: CaSiO3 CO2 - CaCO3 SiO2. Subduction: CaCO3 SiO2 - CaSiO3 CO2 ...

No major glaciations accompanied the Permian, Triassic and Cretaceous ME s. Another major glaciation, ca. 300 million years ago, and lasting 90 million yrs, ...

How do we get glaciers in a methane-rich atmosphere? - rise ... Kump, Kasting, and Crane (2004) Huronian Glaciations: Recovery. CO2 outgassing. Snowball Earth ...

Glaciations help determine where resources have been ... Location of Otter Creek Gold Mine, Quaternary International 82 (2001) 33 50. Future Prospects of ...

... in solar input to Earth. Solar Cycle. 11-year ... Earth's climate is theoretically susceptible to episodes of global glaciation. ... Snowball Earth Glaciations ...

... provides evidence of past glaciations. ... Causes of sea level change: ... will be introduced to global warming, the effects of rising temperatures and sea ...

Most is inaccessible (Antarctica, Greenland) Important water source (together with snow ... Pluvial lakes. Changes in volume of ocean water: sea level response. ...

The Milankovitch Astronomical Theory explains regular climatic changes. During a certain point in time, at 60 degrees to 70 degrees north, the Arctic ...

Relative Dating Techniques Sierra Nevada, California R.M. Burke and Peter W. Birkeland A review by Karen K. Shell ESS 433

Lake Matheson, near the Fox Glacier in South Westland, New Zealand, is famous for its reflected views of Aoraki/Mount Cook and Mount Tasman. A traditional mahinga kai (food gathering place) for Maori people, the lake contains long finned eel as well as being home to many water birds. Lake Matheson was formed by glaciation ca. 14,000 years ago. It is situated on the valley floor about 12 km from the current Fox Glacier and Aoraki/Mount Cook, the highest peak in New Zealand, and Mount Tasman.

Major Ice Age Periods Fluctuating cool periods on Earth which lasted for millions of years 2100-2400MM years ago Huronian 800-600MM years ago Snowball Earth

... for the spin axis precession cycle. 23,000 ... Consequences of precession ... Precession causing aphelion (low radiation) to occur at N. Hemisphere summers ...

1. Late Proterozoic (800-600 My BP) 2. Parts of Ordovician and ... Eurasian and North American Ice sheet reconstruction. Glacial erratics and erratic trains ...

Loess deposits - covering Memphis! ... Small and rapid changes may not be picked up in this record. ... May temperatures fell (Indiana had snow for 17 days) ...

Wind - eolian = sand or silt (loess) Gravity = colluvium ... ice - made of : sand, silt ,clay, gravel, ... Outwash - often stratified sand or sand and gravel ...

CO2 loss = carbonate sedimentation organic burial ... Rate of organic carbon burial decreases a lot, if seafloor is oxygenated and has ...

Relations Terre - Soleil L homme et sa Terre Ceci permet l tre humain et tout ce qui fait la vie d exister dans l environnement terrestre que l on ...

OROGENY, SEA-LEVEL AND STRONTIUM ISOTOPES A. M. C. eng r T Maden Fak ltesi, Jeoloji B l m , Ayaza a 34469 stanbul, TURKEY

Title: Slide 1 Author: Lawrence McGlinn Last modified by: COAS Created Date: 12/28/2006 2:09:16 AM Document presentation format: On-screen Show (4:3)

Low Mountains Wide Eroded Valleys ARCTIC LOWLANDS AND INNUITIAN MOUNTAINS The Arctic Lowlands and Innuitian Mountains are the last of the landform regions in Canada.

L' volution de celui-ci est un facteur essentiel de l'histoire de l'humanit , ... degr s celles actuelles et on peut s'attendre un retour de la glace dans ...

Use this program to review the knowledge you have gained from your notes, text, ... A. Fortification. B. Slash & Burn. C. Signals. D. Lousing. Correct ! ...

Permo-Carboniferous. Sil-Ordovician. Proterozoic (late, early) Permo-Carboniferous glaciation. Major phases of Late Proterozoic glaciation. 850-800 ...

Proterozoic (late, early) Permo-Carboniferous glaciation ... Early Proterozoic Glaciation. Evidence in Gowganda Formation north of Lake Huron ...

A chronostratigraphic division of the Precambrian: possibilities and challenges

relocating to another life conducive planet would be risky, and probably involve ... life might also exist on outer planet moons, comets, and asteroids (some of ...

Late Cenozoic Geology Neogene Period/Pleistocene Epoch ... Ordovician (North Africa) Ediacarian (700 mybp)-Snowball Earth?? Late Archean/Early Proterozoic (2 ...

Anoxygenic photosynthesis. Limited by substrate. How readily did recycling and regulation emerge? ... Oxygenic photosynthesis ( 2.6Ga) Unlimited free-energy ...

Climate on Geologic Time Scales

LANDFORM REGIONS IN CANADA Classroom Notes and Descriptions Landform Regions in Canada There are eight distinct landforms in Canada: Western Cordillera Region ...

What balences this release of carbon from volcanoes? WEATHERING. Weathering. What is weathering? ... CO2 is emitted from volcanoes above subducting plates ...

Ice Sheets and Glaciers

Thumbnails of lecture s (6/page) available from instructor. No ... the Penck-Bruckner model (1909) 'the great interglacial' Quaternary temperature. pulses' ...

1) What is the source for high levels of greenhouse gases in Earth's earliest atmosphere? ... Oxidize rapidly in atmosphere. Are biologically utilized. H2O ...

Chapter 13 Premodern Humans Chapter Outline When, Where and What Premodern Humans of the Middle Pleistocene A Review of Middle Pleistocene Evolution Middle ...

Terrace formation has been ascribed to changes in sediment supply and/or water ... Thermoluminescence, -Radiocarbon -Palemagnetic ...

What Caused the Intensification of the Northern Hemisphere Glaciation? ... Neogene stratigraphy, paleoceanography and paleobiogeography in northwest South ...

Today s Topics Regarding Global Effects Future CO2 Forcing Climate Sensitivity Feedbacks Natural Short and Long-term Forcings Global Warming Impacts

Followed by ice-rafting. Icebergs were dumped into N. Atlantic from Iceland every 1,500 years ... NADW slowed particularly during major ice-rafting events ...

The Late Paleozoic Ice Age: Dynamic Glaciation In An Icehouse World

Arctic `ice cap` appears ~2.5 million y BP, due to: closure of Isthmus of Panama ... 3 glaciation centres (Labrador/Keewatin/Fox Basin) Cordilleran western Canada ...

have been made of both planktic and benthic species, is. that similar isotopic variations are recorded in ... precession, obliquity and eccentricity functions. ...

L' volution de celui-ci est un facteur essentiel de l'histoire de l'humanit , ... vie, qui d terminent directement les choix des groupes humains : migrations, ...

Basalt. Volcanism. Extrusive igneous rocks. Different chemistry. High Silica ... Low Silica ~50% Basalt. Chemistry controls viscosity. Rhyolitic very viscous ...

Mountains and volcanoes were present in the Appalachian region. ... These include the famous St. Peter Sandstone, an unusually pure, well sorted, ...

The thermal properties of water are responsible for the mild ... The chemical and physical properties of water make it ideal to support life. The Water Molecule ...

Title: Carbon Cycle thresholds of the snowball Earth Author: Ryan Ewing Last modified by: Ryan Ewing Created Date: 11/28/2005 6:59:21 PM Document presentation ...

Holistic assessment of glacial sediment/landform associations across scales. WHAT IS THE GLACIAL ... Aeolian reworking ventifacts and removal of fines ...

... 101325 Pa) water is stable if the surface temperature ... Stable system which resists change following a perturbation. positive coupling. negative coupling ...

... rise = 0.4 million km3 of ice. Total global ice volume can be compared with insolation ... Ice-rafted debris in non-fossiliferous sediments west of Ireland ...

Many species get extinct without ever been known ... Quercus robur. Salix caprea. Salix cinerea. Salix pentandra. Sorbus aria. Sorbus aucuparia ...

The Gulf Stream is an ocean current that carries warm water along the eastern ... The Sahara Desert is bordered on the west by the Atlantic Ocean. ...

... areas of ocean within 30 ppm of atmosphere. Glacial surface ocean must also have ... Suggest that the ocean would respond to natural changes in iron inputs ...

Chapter 19 The Neogene World