The Paleogeographic Atlas Mission (PGAP has existed as analysis enterprise at The College of Chicago since 1975 when Shell Oil supplied initial funding to Alfred (Fred) M. Ziegler. Their lower concentrations in the course of the Pleistocene Ice Ages indicate that they contributed to the overall cooling in the course of the Pleistocene Epoch-a couple of 7.2°F (four°C) world common lower in temperature. In these maps an try was made to re-create the distribution of land and sea not solely on the continents but also in the area of the trendy oceans—by extrapolating from information from the encircling land.
And paleogeographic proof contributed to the development of continental drift idea, and continues to inform present plate tectonic theories, yielding details about the shape and latitudinal location of supercontinents such as Pangaea and ancient oceans comparable to Panthalassa , thus enabling the reconstruction of prehistoric continents and oceans.
The geography of the geologic previous; issues all bodily aspects of an space that may be determined from the study of the rocks. Samples of historical air trapped within the ice cores indicated that levels of carbon dioxide and methane within the environment were decrease during the ice ages.
Apart from a likely link (albeit broken by a number of marine gaps) to Africa for a lot of this time (it’s notable, that the current-day/latest biota of Madagascar signifies that the ancestors of five land-mammal orders, plus bats, crossed the > 400-km-huge Mozambique Channel at completely different times in the Cenozoic), it is attainable that the Kerguelen Plateau connected India and Australia-Antarctica within the mid-Cretaceous (roughly 115-ninety Ma).
Click on HERE to visit Dr. Blakey’s web site to study more about paleogeography and how the continents have changed place throughout geologic time. Over the past a long time, a number of researches have been carried out addressing the structural geology, paleogeography, paleobiology, trace elements, stable oxygen and carbon isotopes, natural geochemistry, etc.