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Ruger9a

Fauna???? ID request

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Ruger9a

Good morning forum.  Can anyone tell me if this fossil is fauna or ?????  It's from the early Triassic, lower Muschelkalk, Libiaz, Poland. Matrix is 70 x 50cm

Muschelkalk4.jpg

Muschelkalk2.jpg

Muschelkalk1.jpg

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Ruger9a

Thank You Plax!!!!  You're right on the money.  This is what I found based on the information you provided  -  Gastrochaenolites is a trace fossil formed as a clavate (club-shaped) boring in a hard substrate such as a shell, rock or carbonate hardground. The aperture of the boring is narrower than the main chamber and may be circular, oval, or dumb-bell shaped (Kelly and Bromley, 1984). Gastrochaenolites is most commonly attributed to bioeroding bivalves such as Lithophaga and Gastrochaena

 

Lithophaga seems to be the culprit as it's a "stone eating" bivalve.  

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