More recently, the absence of supporting material in ice core studies (such as the Greenland Dye-3 and Vostok cores), bristlecone pine tree ring data, Swedish clay varves, and many hundreds of cores taken from ocean and lake sediments from all over the world has ruled out any basis for the proposition of a global catastrophe of the proposed dimension within the Late Holocene age. Also, the fossils, geological deposits, and landforms in "Earth in Upheaval", which Velikovsky regards as corroborating the hypothesis presented in "Worlds in Collision" have been, since their publication, explained in terms of mundane non-catastrophic geologic processes. So far, the only piece of the geologic evidence which has shown to have a catastrophic origin is a "raised beach" containing coral-bearing conglomerates found at an elevation of 1,200 feet above sea level within the Hawaiian Islands. The sediments, which were misidentified as a "raise beach", are now attributed to megatsunamis generated by massive landslides created by the periodic collapse of the sides of the islands. In addition, these conglomerates, as many of the items cited as evidence for his ideas in "Earth in Upheaval", are far too old to be used as valid evidence supporting the hypothesis presented in "Worlds in Collision".