Ruger9a Posted January 14, 2020 Share Posted January 14, 2020 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 Quote Link to post Share on other sites
Plax Posted January 14, 2020 Share Posted January 14, 2020 If there's a clam steinkern inside the fat end I'd say it was gastrochaenolites? May have it misspelt. Basically a mollusk tube burrow or dwelling. Could be very wrong here though as I have no experience with this area or age. 6 Quote Link to post Share on other sites
Ruger9a Posted January 14, 2020 Author Share Posted January 14, 2020 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. 3 Quote Link to post Share on other sites
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