ID backyard fossil

[M.R.Zumbehl]

Back yard find, along w/ other coral types.  Clay soil w/ broken limestone, common in San Antonio. The lower portion has a few clear coral-type cells, Opposite end, usually w/ radial pattern in rugosa, is smoothed oval dome.  Can't find similar type in variety of fossil sites online. 

[IsaacTheFossilMan]

The smooth end is banded chert, or perhaps sandstone. The other end does appear to be coral, but that's all I can say, unfortunately.

[Fossildude19]

Cropped, brightened and rotated :

 

 

I don't see any evidence of coral here.   

[M.R.Zumbehl]

1 hour ago, IsaacTheFossilMan said:

The smooth end is banded chert, or perhaps sandstone. The other end does appear to be coral, but that's all I can say, unfortunately.

Thanks! That helps alot so I can stop searching.MZ 

[M.R.Zumbehl]

3 hours ago, Fossildude19 said:

Cropped, brightened and rotated :

 

 

I don't see any evidence of coral here.   

At 2 1/4 " to 2 3/8" are about 5 tiny cells, 1 mm, each w/ what appears to be tiny quartz crystal.  Piece does have sandstone texture on this side, so maybe sand crystals.  Thanks for taking  time to check this out!  This one item was my sole reason for getting on TFF site  MZ  

[Rockwood]

I'm invoking the Texas rule and calling it a rudist.

[Fossildude19]

2 hours ago, M.R.Zumbehl said:

At 2 1/4 " to 2 3/8" are about 5 tiny cells, 1 mm, each w/ what appears to be tiny quartz crystal.  Piece does have sandstone texture on this side, so maybe sand crystals.  Thanks for taking  time to check this out!  This one item was my sole reason for getting on TFF site  MZ  

 

Not seeing coralites or septa.