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Registration No. : GSM 21547 . Type : Not Designated a Type
Identifications :
Old:   Mollusca: Ammonoidea  [Aulacostephanus sp.]  
New:   Mollusca: Ammonoidea  Aulacostephanus (Aulacostephanoceras) fallax Ziegler  
Locality : Speeton - North Yorkshire. 
Grid Reference : Available from curator Country : England 
1:50K map : 55    
Chronostratigraphy : Kimmeridgian Age — Kimmeridgian Age  
Lithostratigraphy : KIMMERIDGE CLAY FORMATION 
Collector / Donor : Available from curator
References :
Ziegler 1962 Palaeontographica 119A