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Big Brook Invertebrate ID Help


historianmichael

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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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Follow me on Instagram (@fossil_mike) to check out my personal collection of fossils collected and acquired over more than 15 years of fossil hunting!

 

 

 

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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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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

Follow me on Instagram (@fossil_mike) to check out my personal collection of fossils collected and acquired over more than 15 years of fossil hunting!

 

 

 

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

  • I Agree 1

“You must take your opponent into a deep dark forest where 2+2=5, and the path leading out is only wide enough for one.” ― Mikhail Tal

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