Is this considered a bivalve fossil?

[Excited fossil finder]

Worked out of a very larger piece of material. The same that surrounds it's bottom half.

Excavated from backfill dirt used in building a farmhouse approx 1800 in Bleckley co. Ga. U.S.A. 

The actual mold is 100% some type crystallized formation or fossil. Curious on what it actually is and how old it is.

Thank you for any help!

 

 

[Fossildude19]

Welcome to the Forum.

This looks like the internal mold of a bivalve.

Not sure about ID,  as internal molds do not generally preserve identifying details.

(Growth rings or plications.)

Bleckly County appears to be in what is called the Atlantic Coastal Plain, with rocks as old as the Cretaceous era, to modern.

[Thomas.Dodson]

I agree with Tim on bivalve. I'm familiar with that area and the outcrops themselves are Oligocene to Eocene in age, this is probably Oligocene.

[Excited fossil finder]

10 hours ago, Thomas.Dodson said:

I agree with Tim on bivalve. I'm familiar with that area and the outcrops themselves are Oligocene to Eocene in age, this is probably Oligocene.

Thank you Mr.Dodson, the farm that I reclaimed wood from the old house and found the bivalve has a spring fed creek that caused a very large depression in the topography. In a generally speaking flat landed area. Within 300 yards you have the highest point of elevation for several miles and the lowest point of elevation for several miles. My question is would the surface or terrain cause the outcrops to be from even earlier periods? And thank you so much for your time.

[Thomas.Dodson]

1 hour ago, Excited fossil finder said:

Thank you Mr.Dodson, the farm that I reclaimed wood from the old house and found the bivalve has a spring fed creek that caused a very large depression in the topography. In a generally speaking flat landed area. Within 300 yards you have the highest point of elevation for several miles and the lowest point of elevation for several miles. My question is would the surface or terrain cause the outcrops to be from even earlier periods? And thank you so much for your time.

They probably won't be any older than Eocene. Although I don't know the thickness of many formations in the area I'd be surprised if anything natural cut deep enough to get past the Eocene outcrops in that part of Georgia. Even the old quarries in that general area I've seen have never gotten deeper than Eocene formations.

 

Generally speaking most fossils in the coastal plain come from creeks, drainages, ravines, etc. that have cut through the more recent sediments to expose older bedrock. There is also a lot of residual material (residuum) from the Oligocene suspended in more recent clays.

 

 

 

 

[Excited fossil finder]

Thank you Mr.Dodson,  would this other pieces I collected in the same area be an indicator of which of the two era's mentioned? 

[Thomas.Dodson]

11 hours ago, Excited fossil finder said:

Thank you Mr.Dodson,  would this other pieces I collected in the same area be an indicator of which of the two era's mentioned?

I don't believe so. Cherty limestone and chert pieces are common in outcrops for both eras in that area of Georgia.