34°18’
34°45’
42°15’
CB
AP FBC
Ayancik
41°51’
25 km
SINOP
Turkey
Black sea
N
Shell exterior
Ridges
P allet
Shell interior
Transverse
groove
Styloid
apophysics
•
Shell valves with three lobes
divided by single grooves
•
Many fine concentric ridges
on shell
•
Interior with long curved process
(styloid apophysics)
•
P allets paddle-shaped