The theory put forth in this document is a new one, vastly different from those that have been presented to date. This theory is:

The Earth’s continents merged into a single massive continent prior to the Mesozoic Era. This super-continent is known as Pangea (or Pangaea). This continental consolidation and attendant mountain building, resulting from plate tectonic collisions, created an environment where the ambient gravitational force at the lower elevations and flood-planes of the super-continent was much lower than it is today. This permitted the unprecedented physical growth of the dinosaurs. As the continents broke away and drifted apart during the Mesozoic Era, the ambient gravitational field gradually increased, basically reversing the trend in physical size of the dinosaurs. This downsizing process, along with other factors, allowed mammals to increase in size and numbers, eventually displacing the non-avian dinosaurs.

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