Base: In a bowl mix together flour, rolled oats and cinnamon.
In another bowl, beat butter and sugar until smooth and creamy. Blend in flour mixture. Set aside 1 ¼ cups of mixture. Press remainder evenly into 13 by 9 inch, ungreased, cake pan. Bake in preheated oven for 15 minutes.
Topping: In a bowl mix together oranges, banana, apples, raisins, orange juice and cinnamon. Spread topping evenly over warm base, leaving a space about a ¼ inch from the edges. Sprinkle reserved base mixture over top, patting down gently. Bake 15 to 20 minutes longer or until golden brown. Place pan on a rack to cool completely, then cut into bars.