Sentences with phrase «glaciation followed»

Three years ago, University College London professor Chronis Tzedakis had just explained the basic cycles of an ice age to an undergraduate geology class; how the Earth goes through periods of glaciation followed by warmer periods when glaciers melt.

Coming closer to the present we have learned from Antarctic ice cores that for the past 800,000 years there have been regular periods of major glaciation followed by interglacial periods in 100,000 year - cycles.

The LIA was intended by the originator of the phrase Francis Matthes to mean the last 4000 years of renewed glaciation following the warmest part of the Holocene some 6000 years ago not merely a 500 year epoch commencing around 1300.

Not exact matches

This change in ocean chemistry followed a large - scale ice age known as the Gaskiers glaciation.

They have not had the remaking influences of fairly recent glaciation and sedimentation, followed by the biological colonization typical of many rich lands in more temperate zones.

There seem to have been two distinct Cryogenian ice ages: the so - called Sturtian glaciation between 750 and 700 million years ago, followed by the Varanger (or Marinoan) glaciation, 660 to 635 million years ago.

The late Proterozoic — the time period beginning less than a billion years ago following this remarkable chapter of sustained low levels of oxygen — was strikingly different, marked by extreme climatic events manifest in global - scale glaciation, indications of at least intervals of modern - like oxygen abundances, and the emergence and diversification of the earliest animals.

Records of sea surface temperature from oceanic sediment cores, for example, show that the magnitude of warming following several previous glaciations are well - correlated (www.ncdc.noaa.gov/paleo/recons.html).

By matching these isotope ratios to the astronomical cycle — Earth's orbit oscillates between an elliptical and circular path on a roughly 400,000 - year cycle — the researchers found that patterns of glaciation and ice retreat followed the eccentricity of our planet's orbitthey report in the December 22 Science.

From the onset of northern - hemisphere glaciation (about 3 million years ago) to the «mid-Pleistocene transition» (about 800,000 years ago), glacial advance and retreat follows a strong 41,000 - year cycle, which has led to its being called «the 41 ky world» (Raymo & Nisancioglu 2003, Paleoceanography, 18, 1011).

One paper at https://www.sciencedirect.com/science/article/pii/S1055790309004965 mentions the, «Divergence of the Pleurobranchinae into the Antarctic Tomthompsonia and the remaining species in Early Oligocene coincides with two major geological events; namely the onset of glaciation in Antarctica and the opening of the Drake Passage with following formation of the Antarctic Circumpolar Current (ACC).

More recently, Marsh has postulated that the onset of glaciation is also due to variations in solar activity, but does not follow the Milankovitch cycles as described by B&L.

It is to be noted here that there is no necessary contradiction between forecast expectations of (a) some renewed (or continuation of) slight cooling of world climate for a few decades to come, e.g., from volcanic or solar activity variations; (b) an abrupt warming due to the effect of increasing carbon dioxide, lasting some centuries until fossil fuels are exhausted and a while thereafter; and this followed in turn by (c) a glaciation lasting (like the previous ones) for many thousands of years.»

Second, the warming following the end of the last glaciation peaked 8000 to 6000 years ago at what is known as the Holocene Climate Maximum (or Optimum in some sources).

e.g. models of eustacy («worldwide change of sea level as contrasted with local diastrophic uplift or subsidence of the land») vs isostacy (glacial rebound following glaciation / melting) vs local sinking / rising from glaciation / interglacial warming, CO2, and / or solar variations, and their causes.

It is of primary importance to explain that climate change, and subsequent periods of glaciation, resulting from the following three variables is not due to the total amount of solar energy reaching Earth.

Probably explains the yo - yo of CO2 following the glaciation periods.

Early inhabitants Human occupation of the Muskegon area goes back seven or eight thousand years to the nomadic Paleo - Indian hunters who occupied the area following the retreat of the Wisconsonian glaciations.