Below are some pictures of a piece of Favosites coral that shows some interesting growth patterns.
From the top you see the typical honeycomb like arrangement of the corralites.
A cross section view shows long, continuous corallite growth. The white areas are Calcite while the orange areas are Dolomite.
The bottom reveals a wrinkled looking surface that is indicative of the colony growing over sediment.
Here is the most interesting part to me. When you view a cross section of the colony on edge you can see how new area was added.
I found this piece of Favosites coral near Arkona, Canada. It came from the Hungry Hollow member of the Widder formation which is middle Devoian (Givetian) in age.