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Unknown 3    more of this species

found in Bed 19 upper part of the Choptank Formation,  Calvert Cliffs, Maryland, USA  
in material provided by Yasemin Tulu, John Nance and S. Godfrey from
Calvert Marine Museum    Serravallian, Middle Miocene    

View of the inside of a corroded and recrystallized specimen, embedded in Canada balsam with light from above, difficult to tax.

SEM picture taken together with Dr. Rosenfeldt
head of the Mikrobiologische Vereinigung
           Unknown, Calvert Cliffs, Maryland, USA