It is certainly reasonable that early man went to those “island” places or from north Africa to Spain. During ice ages the water level dropped 400 and more feet below the current level. Also, the Mediterranean has dried up more than once. I once read their are 1,000 ft. thick salt deposits at the bottom of that sea. I believe we will find more such “history” if we look, because each ice age drove man back many steps from levels they had reached in good times.