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Big Brook Invertebrate ID Help


historianmichael

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historianmichael

I recently found this really cool double Agerostera mesenterica at Big Brook in New Jersey (Late Cretaceous; Navesink Formation). After I finished cleaning the fossil, I noticed these tiny encrusters on the larger of the two oysters. They don't look like your typical Serpula tube worm trace. I am not quite sure what they are. They almost have the shape of being some other type of bivalve. Any help is greatly appreciated. 

 

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Some close-up photos using my digital microscope

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Rockwood

TFF Something like this ?

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ClearLake

Very neat looking piece. Those are small oysters attached to it. I’m not that great with id’ing oysters and certainly not familiar with what are found in your area but hopefully someone will attach a name to them. 

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historianmichael
Posted (edited)
46 minutes ago, ClearLake said:

Very neat looking piece. Those are small oysters attached to it. I’m not that great with id’ing oysters and certainly not familiar with what are found in your area but hopefully someone will attach a name to them. 

 

Thank you so much! The common oysters in Big Brook are Exogyra costata and Pycnodonte convexa, but I don't think that these are either. This tiny valve popped off during cleaning. I haven't quite figured out where it goes back. My guess from The Cretaceous Fossils of New Jersey by NJGS is Gryphaeostrea vomer (Plate 21, Figure 3).

 

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Edited by historianmichael
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The Jersey Devil

I think it's an Agerostrea with oyster spats attached.

  • I Agree 1
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