TWO APTIAN BIVALVE GENERA OF HETERODONTA FROM THE QIHULIN FORMATION IN EASTERN HEILONGJIANG PROVINCE
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Abstract:
Several bivalve genera or species, ranging from the late Early Cretaceous to early Late Cretaceous, have been found in the Qihulin Formation of the Longzhaogou Group. Among them, the age of Vectianella Casey and Pseudaphrodina Casey is confined to Aptian as known so far, which has great significance to date the Qihulin Formation and Longzhaogou Group. In this paper, the two genera as well as their type species are described systematically, and the age of the Qihulin Formation is also briefly discussed and dated as mainly Aptian.
