It can be a fossil of a freshwater algae or dead remains of an animal? check with a local paleontologist!  good luck!

 Please contact Dr. Syed Jafar Sir for the answer. His researchgate link is given below.

https://www.researchgate.net/profile/Syed_Jafar2

Erik:

Gives visual impression of being an encrusting Bryozoan colony. To be a little sure, determine mineral composition.

Best

Syed

Dear Syed,

thank you very much for your comment! As a biologist I have no idea or means how to investigate the mineral composition. Do you know anybody who may be interested in such a specimen, I would of cause donate it?!

Best wishes, Erik

As stated by Dr. Jafar, it seems to be a bryozoan, but in order to confirm it it would be useful to have an idea on the size. ¿Could you provide a scale?

In the left side of the sample there is another smaller specimen that also resembles a branch of a bryozoan colony.

Dear Syed, dear Sergio,

I made two pictures with a scale on my Windows phone (my Fuji camera appears to have given up the ghost...). I hope the specimen can be seen better now!

Best, Erik

I agree with Dr Jafar that the structure resembles very much a bryozoan. Alternatively, a sponge comes to my mind due to the needles ("spiculae")-structures in the vicinity. Erik, you could visit the "Landesmuseum Hannover" where they have regularily open door on Saturday mornings for hobby fossil collectors for identification of their findings.

Thanks Stephan, I didn`t know of the hobby collector Saturdays at the Landesmuseum Hannover! I hope you are doing well, best wishes, Erik

The size also fit with bryozoans.

Dear all (but especially Syed, Sergio and Stephan),

thank you very much for your help with the identification of this fossil!

Some day in the future I will bring it to the hobby fossil collector event at the Hannover Landesmuseum.

Best wishes, Erik

it looks very similar to one in my collection (bryozoan)

It isalmost certainly an internal cast of a sheet-like cheilostome bryozoan colony.Very nice!