Porifera identification

[GLE]

I have a fossil siliceous sponge from Australia which possibly still exists in the Indo-Pacific equatorial zone in association with Enhalus acoroides and Odontaspis sp. (assuming these two species sometimes occur together).

Would anyone have any idea of the type of sponge this might be?

The sponge seems to begin as small blobs before growing a thick skin over sandy sediments, giving rise to isolated clumps which look like great big boulders. Other times it will simply be a ledge on valley slopes. The skin looks sort of like the inside of a crunchy bar.

Its original position is estimated to have been intertidal.

 

[GLE]

Just a reminder that I'm looking for type not species, so any ideas would be handy.

 

[griss]

@Timfish Any ideas here?

 

[Timfish]

Well, the first two pics look like like some of the travertine that forms locally besides creeks and water falls here in central Texas. But I'm not an expert by any means of fossil species or marine species in the wild. I'm not even sure of the taxonomy of most of the sponges I see in my systems, I just know they appear to be separate species growth forms and coloration.