Which of the following was NOT one of Wegener's 'clues' that 'continental drift' had occurred? •. the similarity between the Atlas Mountains and the Appalachian Mountains in terms of rock type and age • the spatial configuration of landmasses such as South America and Africa • the idea that tectonic plates ride on a layer of magma within the mantle of the earth • the similarity of stratigraphy in rock areas in disparate regions of the world • similar fossil evidence in different regions of the world