Distribution of ostracoda in the lower Cretaceous succession of ODP Hole 80-549 (Figure 3)

<p>Site 549 recovered a Lower Cretaceous succession which has been shown to include parts of the Barremian and Albian stages. Forty-four species of Ostracoda are illustrated and their stratigraphic distribution used to recognise three major facies units. An high diversity inner shelf facies earlier in the Barremian gives way to a low diversity, outer shelf facies, higher in the succession. The early Albian appears to indicate a return to an inner shelf fauna. The faunas recovered have been compared to similar faunas elsewhere in N. W. Europe.</p>

在 Site 549，研究者成功恢复了一套下白垩纪的地层序列，该序列已被证实包含巴雷米阶和阿尔比阶的部分地层。图中展示了44种介形虫物种，并利用它们的层序分布识别出三个主要岩相单元。在巴雷米阶早期，高多样性近岸岩相逐渐过渡至低多样性外岸岩相，这一变化位于地层序列的上部。阿尔比阶早期的出现似乎暗示着近岸生物群的回归。所恢复的生物群已与北西欧其他地区的相似生物群进行了比较。