This one is one of my favorites - a pith cast of Calamites, the ancient horsetail tree. (Compare to images here and here.)
Like the fossils from yesterday, it's about 300 million years old.
Most of north central Alabama's fossils are from this Carboniferous period. (Map.) Here is a nice color-coded map for the whole US. (You can see part of Canada as well, although as usual it's shaded darker, as if nobody ever goes up there.)
My bad mistake with this fossil was not noting where I found it. But I believe it was either at my in-laws' old lake house (Smith Lake, Winston county) or at one of our old birdwatching spots (Jefferson county).
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