| 
Suborder:
 | 
Prolecanitina 
 | 
| 
Superfamily:
 | 
Medlicottioidea 
 | 
| 
Family:
 | 
Medlicottiidae 
 | 
| 
Subfamily:
 | 
Medlicottiinae 
 | 
| 
Genus:
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Neogeoceras 
 | 
| 
Species:
 | 
girtyi+ | 
| 
Qualifier:
 | 
ss | 
| 
Author:
 | 
	Miller & Furnish 1940,p.59	 
 | 
| 
Lower Boundary:
 | 
Roadian--Wordian (Murgabian) [ROA--WOR], 268 million years
 
 | 
| 
Upper Boundary:
 | 
Wordian--Capitanian (Midian) [WOR--CAP], 265.8 million years
 
 |