Preheat oven to 450°F.
In a large bowl combine the dry ingredients: both flours, oats, wheat germ, salt and baking soda. Mix thoroughly all the dry ingredients.
Whisk buttermilk and molasses. Make a well in the center of the dry ingredients. Pour in the buttermilk mixture.
Using a fork or spatula, stir gradually until combined. If it is dry, add 1 tbsp buttermilk at a time until it comes together.
With floured hands, knead into a ball.
Shape the dough into a circle and place on a lined baking sheet. Press flat to about 2 inches thick. It will form a round loaf about 8 inches in diameter.
With a sharp knife cut a deep cross on top of the ball.
Bake in the preheated oven for 15 minutes at 450°F. Reduce the heat to 400°F then bake for an additional 20-25 minutes or until the bottom of the bread sounds hollow when tapped.