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Trigonia-like bivalve Peru


Dennis Richards

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Hi

I recently obtained this specimen at a street market in Peru. Its triangular 3cm x 2cm x1cm.

Looks Trigonia-like.

Any ideas on id and age?

Regards

Dennis

PA150029.jpg

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It certainly does look like a member of the family Trigoniidae. Without information to stratigraphy and site it will be difficult, even for a bivalve expert, to pinpoint the species. It would help if the overlying matrix could be removed in order to see the sculpture better. And like Tony has asked, please show views from different perspectives.

 

Greetings from the Lake of Constance. Roger

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Seems the problem is solved: I found a picture then a reference

Bivalve clam (Roudairia intermedia); Cretaceous; 87 Mya; Cajamarca, Peru

Specimen: Triangular shape: 2.5cm x 3cm x 1cm;

NAME : Roudairia intermedia (Brüggen):

Bivalvia -Veneroidei – Arcticidae - Roudairia intermedia

AGE : Santoniano-Coniacian, Upper Cretaceous , 83-89 Mya

Bed 45, Section 1 - Lajas (Cajamarca Fm) (Cretaceous of Peru)

Where: Cajamarca, Peru (6.6° S, 78.7° W: paleocoordinates 12.4° S, 55.5° W)

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Thanks for the update. 

Good work finding the answer. :) 

Regards,

    Tim    VETERAN SHALE SPLITTER

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The Cajamarca formation of Peru is middle Turonian, not Santonian-Coniacian.

 

59e4b5453297b_Fig4.thumb.jpg.a563a064027cc017d1d8d618e5b436cc.jpg

 

http://fossilworks.org/bridge.pl?a=collectionSearch&collection_no=56897

Clipboard01.jpg.8b866d266992690218b8ede3e53b4e67.jpg

Roudairia intermedia Bruggen is also present in the Celendin formation.

 

reference

 

 

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