These are pieces of a fossil sponge called a finger-like sponge. They were irregularly knobby shaped masses with finger-like projections.
You can see impressions of other sea life embedded in some of them before they hardened.
One of the largest types of fossils was this stout shell of some type of clam (I believe). I found several of them and they were always closed like this one. Most were four to five inches long.
Here, you can see an exceptionally rich section of hardened mud embedded with a great variety of life forms.
Tip: Click on a photo to see a larger version of the image.
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