Early Cretaceous Hiatus Much Longer Than Previously Reported
Early Cretaceous Hiatus Much Longer Than Previously Reported
复制标题
早白垩世的间歇期比之前报道的要长得多
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
D. Engelhardt
中科院分区：
文献类型：
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作者：
L. Furer;E. Kvale;D. Engelhardt
露头数据、电缆测井和孢粉学的整合显示了中部和东北部长达 30 35 Ma 的不整合面分隔了侏罗纪和白垩纪岩石。比格霍恩风黑山的十个花粉日期显示了早至中阿尔布安人的三叶草、富森和拉科塔人。这些日期得到了 Obradovich 等人最近的一份报告（1996 年）洪水事件岩石（即 Skull Creek 页岩 104.4 Ma）的支持。页岩与 Bighorn 盆地的下部 Thermopolis 页岩在时间上相当，该页岩直接覆盖在 Sykes Mt. 地层之上。 Sykes Mt. 相当于 Black Hills 的 Fall River 地层。
integration of outcrop data, wireline logs, and palynology shows the unconformity separating the Jurassic and Cretaceous rocks in central and northeastern long 30 35 Ma. Ten pollen dates in the Wind Black Hills, Bighorn show the Cloverly, Fuson, and Lakota Early to Middle Albian. These dates supported by a recent report by Obradovich and others (1996) flooding event rocks (i.e., Skull Creek Shale 104.4 Ma). shale has correlated to be time-equivalent to the lower Thermopolis Shale in the Bighorn Basin where this shale directly overlies the Sykes Mt. Formation The Sykes Mt. is equivalent to the Fall River Formation of the Black Hills.