Unknown shells

[Creek - Don]

What is this? I found these pieces next to a creek on duck creek formation nearby Lake Texoma.    It appears to be a shell, but doesn't look like any other shells I found elsewhere. 

[Al Dente]

Looks like bits of fish tail.

[Creek - Don]

That was it.  I was able to find North Texas fossil page and compared to what you described. 

 

Fossil fish bone

 

 

Fossil fish tail bone 

 

[Mark Kmiecik]

Cool find. How big are they?

[Creek - Don]

13 minutes ago, Mark Kmiecik said:

Cool find. How big are they?

Thanks. Largest piece shown on third photo is about 1 1/2 inch wide and other pieces are about 1/2 to 1 inch.  

[Mark Kmiecik]

Just now, Creek - Don said:

Largest piece shown on the last photo is about 1 1/2 inch wide and other pieces are about 1/2 to 1 inch.  

That would make it a fairly large fish, not huge but no minnow either.

[Creek - Don]

20 hours ago, Mark Kmiecik said:

That would make it a fairly large fish, not huge but no minnow either.

 But no where compare to this monster displayed at Perot museum in Dallas.  

90 million year old fish called Pentanogmius fritschi  which were 5 ft 5 inches long and used to live in Western Interior Seaway. 

 

 

I think that photo was a different species, but this is the correct one. 

[Mark Kmiecik]

...or this one! Forum member Xiphactinus and his 17-foot Xiphactinus.

 

[Creek - Don]

That's some scary fish.