Suborder:
|
Tornoceratina
|
Superfamily:
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Pseudohaloritoidea
|
Family:
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Pseudohaloritidae
|
Subfamily:
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Shouchangoceratinae
|
Genus:
|
Elephantoceras |
Qualifier:
|
ge |
Author:
|
Zhao & Zheng 1977,p.232
|
Lower Boundary:
|
Roadian--Wordian (Murgabian) [ROA--WOR], 268 million years
|
Upper Boundary:
|
Wordian--Capitanian (Midian) [WOR--CAP], 265.8 million years
|