Are these fossils? What are they? Found in Germany

[Nat006]

I went to a geo-park which has a popular hiking trail. This park is known for fossils and it's in Odenwald, Germany. 

I found these 3 rocks in the forest in the said hiking trail and I was wondering what they are and if they are fossils? If not fossils, what are they? 

 

The first three pictures are of the first piece. To me, this looks a bit like a seashell. 

 

The next two pictures are of the second piece, and it has strange markings and inclusions.

 

The last two pictures are of the third piece I found. This looks almost man-made but it's a rock and very hard. No idea what it could be.

 

thank you!

 

 

[Tidgy's Dad]

The first five show brachiopods. 

First one looks like an athyrid and the ones in the block look like pentamerid internal molds. 

But they could all be terebratulids, I suppose. 

[Nat006]

50 minutes ago, Tidgy's Dad said:

The first five show brachiopods. 

First one looks like an athyrid and the ones in the block look like pentamerid internal molds. 

But they could all be terebratulids, I suppose. 

This was so incredibly helpful, thank you!! Do you have any idea what's going on in the last two pictures? What caused the lines on it, is that just a normal formation for limestone?

 

Thank you again

[Tidgy's Dad]

1 hour ago, Nat006 said:

Do you have any idea what's going on in the last two pictures? What caused the lines on it, is that just a normal formation for limestone?

I just do brachiopods. 

[Mark Kmiecik]

The last two look like differential weathering of the layers of sedimentary stone.

[IsaacTheFossilMan]

Last two show exogenic processes on layered stone - weathering from what looks to be water wear. Each layer has a different makeup, and will weather slightly differently. 

 

The others are indeed brachiopods, I don't have time to take a look at them all, but the first one screams terebratulid - but could also by athyrid. Would need to see more of the fossil - consider dissolving some of the matrix with an acid like acetic acid from vinegar, or scratching the matrix with needles / a dremel.

Edited July 6, 2022 by IsaacTheFossilMan