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34°18’

34°45’

42°15’

CB

AP FBC

Ayancik

41°51’

25 km

SINOP

Turkey

Black sea

N

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Shell exterior

Ridges

P allet

Shell interior

Transverse

groove

Styloid

apophysics

•

 

Shell valves with three lobes
divided by single grooves

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Many fine concentric ridges
on shell

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Interior with long curved process
(styloid apophysics)

•

 

P allets paddle-shaped

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