More misc pieces I can't figure out

[Quer]

 

 

Hi,

Again from a rudist-coral reef (limestone, Maastrichtian, SE of the Pyrenees),

 

1

 

2. About 20 cm. diameter.

 

3. From a different strata: Campanian-Maastrichtian calcareous marlstone/marlstone

About 2 cm long

 

Burrows ?

 

[ynot]

1 likely concretions.

2 crystalized rock (selenite or calcite).

3 do not know

last picture Could be burrows that have turned to chert or could be silicate concretions.

[Pachy]

3. 

It can be a sectioned coral, very crystallized.

 

Burrows ?.

It can be siliceous sponges.