An angiosperm index-1 and an angiosperm index-2 are correlated to an age of a liquid hydrocarbon sample and can be used to distinguish oil age of Late Cretaceous (100-65 million years before present, or 100-65 Ma BP) vs. Paleogene (65-55 Ma BP) vs. Eocene or younger (<55 Ma BP). This method improves over existing methods that cannot distinguish oil age between Late Cretaceous and Miocene (ca. 100-5 Ma BP).
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机译：Angiosperm Index-1和Angiosperm Index-2与液态烃样品的年龄相关，可用于区分后期白垩纪的油时年龄（100-65万年前或100-65 mA BP）与古雄（65-55 mA BP）与何种群体或较小（<55 mA bp）。该方法改善了在晚白垩统计和中生之间的油时代（约5-5 mA BP）之间的现有方法。
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