User:RAYLEIGH22/sandbox

M. Ewing wrote that beach sand from prehistoric times was brought up in two deep sea cores, one from 3 km and the other from 5.5 km. These two cores came from an area over 1000 km from the coast on the Mid-Atlantic-Ridge. There were two layers in one core of sand which dated according to sedimentation rates at 20,000 to 100,000 years and in the other at 225,000 to 325,000 years. R.W.Kobe found numerous diatoms from freshwater on the Mid-Atlantic Ridge from several cores that were taken over 900 km distance from the coast of Equatorial West Africa. He claimed that this was evidence that the area in question was islands 10 – 12,000 years ago. The diatoms that he found he said were deposited as sediment in fresh water lakes which were later inundated under 3km of sea water. He states that this was a more plausible explanation than the claim that turbidity currents had moved the diatoms 930 km along the sea bottom and then lifted them up over 1000 km and deposited them on a the top of a submerged hill .

B.C. Heezen et. al. reports that at 37 degrees North the Atlantis seamount located on the Mid-Atlantic Ridge is flat topped at a depth of around 180 fathoms and has a current-rippled sand and or cobbles. Around a ton of limestone cobbles were brought up from the summit a sample of which gave a radio-carbon date of 12,000+/- 900 years. B.C. Heezen and colleagues states that that the limestone was lithified in a location above the water and that his is evidence that the seamount had once been an island but was submerged in the last 12,000 years

There is much evidence of of a warming period beginning at the end of the last glacier age 12,000 years ago at the Pleistocene–Holocene boundary. Or, approximately 2,000 years from the beginning of the Anthropocene epoch. This climate change is evidenced by a worldwide change in the character of deep-sea sedimentation, a marine transgression evidenced by radio-carbon dating, deep sea cores that reveal color changes, changes in foraminiferans that are indicative of changes in plankton and by migration of foraminiferans 1000 to 3000 km toward the poles seeking cooler waters. In the case of mid-latitude ice sheets once melting starts, the ice disappears at a tremendous rate. The melt rate reached a maximum about 8000 bp, liberating 18 trillion (18 × 1012) metric tons of meltwater annually. This corresponds to a rise in sea level of five centimetres per year. Throughout this pre-history period the geologic record reveals many cyclic rise and fall cycles in ocean levels throughout the world.

Anthropocene Epoch

The most interesting thing about the Anthropocene Epoch is that it fits approximately with Plato's description of the rise of multiple settlements of humanity around the world after the time he fixes the demise of Atlantis. It also fits approximately with the end of the last ice age in North America and around the world.